Why is My Car AC Blowing Hot Air?

Broken ACJumping into your car after a sunny spring day can be an unwelcome surprise.  The windows and cabin of your vehicle act a lot like a greenhouse when it’s left in direct sunlight.  The sun’s energy can enter through your windows or be absorbed by the metal roof but has no way to escape.  This heat is trapped and can cause the interior of your vehicle to get extremely hot on sunny days.  You can help mitigate this effect by tinting your windows, choosing a light color paint or using a windshield sunshade but those are not solutions, they just lessen the problem.

The great thing is we live in a country with air conditioning almost everywhere.  Let’s be honest, when a soft top jeep has air conditioning as an option, we’re a country that likes to be comfortable.  So you jump into your hot car, throw on the AC and you get hot air blowing.  Not to worry, it takes a few seconds for the air conditioning system to come up to pressure and start cooling your cabin air.  Now you’ve waited 15 seconds.. now 30.. now 2 minutes and you’re still getting nothing but hot air.

So now that you are sweating, and frustrated it can be tempting to zip into the dealership and pay them whatever they ask to fix your air conditioning.  This is an option, but before you break the bank, head home and let’s take a look at some common easy to fix problems that would make you ask: Why is my car AC blowing hot air?

Common Easy to Fix Air Conditioning Problems:

  • Blocked Condenser
  • Broken Condenser
  • Low refrigerant
  • Broken cooling fans

The condenser in your air condition system looks a lot like a radiator and is mounted at the front of your vehicle.  It is used to cool the hot compressed refrigerant back to ambient temperature as it comes from your compressor and uses the air your car is traveling through to do that.  If this isn’t accomplished, the still warm refrigerant will travel through the expansion valve and rather than getting comfortably cold, it is only cooled back down to ambient temperature and will cause your AC to blow hot.  Since the condenser is at the front of your vehicle, it has the opportunity to get clogged by all kinds of road debris from leaves to plastic bags or anything else you might stumble upon.  A quick visual inspection and removal of these air blocking items may return your air conditioning to normal operation.

AC Blowing HotSince your condenser is at the front of your vehicle it is also subject to less kind road debris like rocks, sticks or other hard objects that may puncture it.  If the puncture is large and easy to see, replacement is a must.  Before you head back to the dealership, consider changing the condenser yourself.  They often are mounted to your car’s frame with just a few bolts, only have 2 refrigerant lines which should be easy to remove, and are easily accessible since they are at the front of your vehicle.  If you cannot see the puncture, consider adding UV dye to your air conditioning system to identify the puncture point, or simple add BlueDevil Red Angel Air Conditioning Stop Leak to your air conditioning system to quickly and permanently seal the leak.

 

Similarly, you may have a low refrigerant situation due to other causes like loose connections, old hoses or the simple escape of refrigerant over time.  These small leaks can cause your air conditioning system to stop blowing cold air.  Before you recharge your air conditioning system, add BlueDevil Red Angel A/C Stop Leak to ensure your system is properly sealed and will stay charged.

The last easy to fix problem you may have with your air condition system in your vehicle is a broken cooling fan.  The condenser can only cool the refrigerant if it has air moving over it.  If you are driving at low speeds or stopped in traffic or at a light, a fan can provide the adequate air flow to keep your air conditioning system working properly.  Over time this cooling fan may become worn out and stop working.  It also may blow a fuse or become clogged or blocked by debris.  Be careful when checking around any fan as it may start at any time!  Checking to make sure the cooling fan has power and is working properly will ensure your air conditioning system works under any driving conditions.

Red Angel AC Stop Leak & Conditioner

A simple visual inspection and a can of BlueDevil Red Angel A/C Stop Leak is all you need to solve all the common easy to fix problems with your air conditioning system!  Stop by one of our partnering auto parts store today to pick up a can of BlueDevil Red Angel A/C Stop Leak.

  • NAPA
  • O’Reilly Auto Parts
  • Pep Boys
  • Bennett Auto Supply
  • AutoZone
  • Prime Automotive Warehouse
  • Advance Auto Parts
  • CarQuest Auto Parts

You can also purchase BlueDevil Red Angel A/C Stop Leak online directly from BlueDevil here.

Pictures provided by: plazaautomotive.com and www.ultimatesubaru.org

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445 responses to “Why is My Car AC Blowing Hot Air?

  1. I have a 97 honda civic and my ac band busted and my ac stopped blowing cold air. I changed the band that busted ( the one that goes around ac compressor ) and it still doesn’t blow cold air. I tried to put some freon in but that didn’t work it still blows hot . The band is running on all pulleys good, what can be the problem???

    1. Thanks for your question about your Honda Civic. We’re sorry to hear your air conditioner isn’t working properly, but great job on getting the belt changed! It sounds like when the original belt broke it may caused some more problems. It is possible that when the belt broke, it damaged the wiring or one of the lines going to the AC compressor. You can start by checking to see if the compressor is engaging by having a friend turn the air conditioning on full while you are watching the engine run. When they push the AC button, the center of the AC compressor pulley should start to turn along with the pulley. If that doesn’t happen your compressor may not be receiving the electrical signal to engage due to broken wires, or it may not be engaging because of a low pressure caused by very low refrigerant levels if a line was knocked off or broken when the belt broke. If the center of the compressor is turning when the AC button is pushed you will need a set of AC gauges to measure the pressures across the compressor to determine if it is working properly. You can start by checking to make sure all the wires are connected, but after that you may need a mechanic or AC gauges to make a further diagnosis.

      1. My compressor turns on and off like every 3 to 5 seconds when the car is running with the air condition on. Air condition is blowing hot air now. Does that mean it needs to be replaced.

        1. Tina,

          Depending on what kind of car you have it is possible that your compressor is ok and that is the standard cycle time. It does sound a little bit short for most vehicles so it could be an indication that you have a clog somewhere in your system so it reaches a high pressure very quickly and shuts the compressor off. To find a clog, you will need to measure the pressures at each component to determine where the clog is, then replace that component.

          Thanks again for your question!
          -BD Auto Pro

        1. Ngoc-

          Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

          Thank you!

          -BDP

    2. My 2003Hyundia Santa Fe is blowing hot air put a gauge on it is showing in the red I was told to take it to a shop and let them look at it because it could have a leak not sure what to do

    3. I have a 2002 bmw 530i blow hot an cold air when recharge refrigrent blows cold for 10 min then hot an cold again ac compressor works ac fan works blows of Gas frm compressor

      1. Ravindra,

        Thanks again for your question about your BMW 530i. Based on your description it sounds like your system has a refrigerant leak. If you add more refrigerant and the system works for 10 minutes then stops working it could be because the new refrigerant has leaked out. You can try using Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) then adding more refrigerant to get the system circulating and allow the Red Angel to seal the leak.

        Thanks again for your question!
        -BD Auto Pro

    4. I have 2000 Silverado ,I replace compressor,drier,expansion valve my truck blows cold for 3-weeks,than it blows hot (what is the problem?)

      1. James,

        Thanks for your question about your Silverado. Assuming you didn’t develop a leak, it’s possible that when the new parts were installed some debris got into the system and now you’ve got a clog. You could prove that by measuring the high side pressure after the compressor and seeing if somewhere it spikes or drops before the expansion valve. Since its only been 3 weeks you may consider taking your truck back to the shop that did the work and seeing if they will check their work to see if something they did has caused the problem.

        Thanks again for your question!
        -BD Auto Pro

  2. I have a 2005 Ford Crown Vic and my air has been working fine since I got the car Valentine’s day of this year (2014). Once I cut my heat on Saturday (09/13/2014) the air will not work. When I cut the air on, the heat blows and even when I turn everything off I still feel heat coming out of the vents… What could this be??

      1. i have a 2001 japanese model Corolla 1.3l

        i changed my ac compressor 4 months ago.
        today i understood that when in idle. it cools less. i opened the front. and checked the cold pipe.
        wen i revd, it got colder. when i stopped reving, it got less cold.

        im in saudia. but its not that hot nowadays.

        is this sign of bad compressor? coz i jus got it new, havent used one full season. n its a DENSO Japenese compressor.

        maybe its not getting enough power? need your guidance.

        1. Junaid,

          Thanks for your question about your 2001 Corolla. The symptoms you’re describing could be an indication of a bad compressor or simply a low refrigerant level. Unfortunately, to discover which is the problem, you will have to measure both the high and low side pressures in the system. If the low side pressure is too low, you most likely need more refrigerant. If your high side pressure isn’t high enough, or the pressure rise across the compressor is low at idle, it could indicate that your compressor is failing.

          Thanks again for your question!
          -BD Auto Pro

    1. It could be also that one little button with a car and a sideways “U” shaped arrow. That button means when its pushed you’re allowing air from outside come in through the vents

  3. Hello , my 2001 F-150 is blowing hot air , i try to add some ac but i get a lot of back pressure , from where i connect the ac refill canister could you give an idea why this happen,
    Thank you for you time

    1. Pedro-

      Make sure the engine is running and the A/C is turned to maximum cooling when you add Freon. You should also make sure that you are connecting to the low-side service port and not the high-side.

      -BDP

  4. The air in my 2007 ford taurus doesnt blow cold air but sometimes it blows cool air then warm air I replaced the belt and the compressor works and I put two cans of freon in it what’s the problem???

  5. Yesterday my the AC in 2006 Hyundai Accent was working just fine. Then on my way home it started blowing out hot air. My question is what has made the AC to blow out hot air, the blower works just fine because it is blowing out hot air. Any suggestions?

    1. Theresa,

      Their is a good chance you have a leak in your system. You can try to recharge with freon but if it goes warm again, you’ll know…

      Red Angel AC Stop leak may be a great solution for you.

      -BDP

  6. I am driving a very old Toyota Corolla. Its air conditioner was fine. But after a few months, it is not working. It’s only blowing warm air. It’s definitely not a fan problem because the air is not cool even though I was driving at a high speed. It’s not the compressor too becauase it spins when I turn on the AC. So what problem could it be?

    1. Gabe-

      It is possible that you have a leak in the A/C system and have lost most or all of your Freon. If that is the case your vehicle would be a great candidate for using our Red Angel A/C Stop Leak and then you would recharge the system behind it.

      -BDP

  7. 2001 Honda civic is not blowing any air. Have replaced the blower and the climate control panel. Still not solved. Where can I look next?

    1. Tom,
      Thanks for your question about your 2001 Civic. You’re on the right track and have replaced the most common elements that would have failed in your blower motor fails to operate in any speed, even high. There are a few other components that feed electricity to your car’s blower. There are two fuses that affect your blower motor. One in the engine bay fuse box and one in your under dash fuse box for the blower motor relay. The blower motor relay should also be in the under hood fuse box. If all these components check out good, you can check the blower motor resistor to make sure it’s good as well. The resistor is what allows the blower motor at different speeds so when it fails, usually only 1 or 2 fan speeds fail at a time. Hopefully one of those components have failed causing your fan not to run.

  8. I have a 2008 Chrysler 300. The problem is that with out even turning the A/C on or air my car is blowing hot air. Why is this happening?

    1. Adrian-

      First of all, we are sorry to hear that your Chrysler is acting up. You need to check the blend door. Look under the dash while moving the temp from hot to cold, you should be able to see the blend door move. Some vehicles have had a problem with the foam getting caught in the door. If this happens the entire heater assembly has to be removed. Hope this helps!

      Thanks,

      -BDP

      1. I have a 2000 dodge venture van. when I turn it on hot air is thrown but the ac is not even on. Can you help me please?

  9. I have a 97 Honda Passport. when we first got the car the freon was low so I added R-134a and it blew cold air for a good while, then it just stopped. So i added a freon leak detector and did not notice any leaks. but when I checked the gauge recently it was in the Alert section of the gauge. but when I turn on the AC now there is a noise coming from behind the glove box which im guessing is the blower motor, could that be a problem of the warm air? but the sound just happened recently so I am unsure

    1. Christian,
      Thanks for your question about your Honda Passport. It sounds like your problems are unrelated. If you are hearing noise from behind the dash, specifically near the glove box when you turn the fan on, it is most likely your blower motor as you said. Often times, the cabin air filter is right on top of the blower motor fan so the best thing to do would be to remove your cabin air filter and see if it is damaged or full of debris. Replacing the filter may help stop that sound.

      It also sounds like you have a leak in your air condition system as your pressure was low even after adding R-134a. It is possible that your leak is somewhere inside the cabin of your Passport making it hard to find. You can always add BlueDevil Red Angel to your vehicle’s air conditioning system to seal the leak. BlueDevil Red Angel can be added the same way you added the R-134a and it will stay inert in your system until it reaches the leak point. There, it will form a chemical weld sealing your air conditioning system so you will stop loosing pressure. You can purchase BlueDevil Red Angel here: http://bit.ly/L3fS0V

  10. I have 2008 lincoln town car. When i turn on AC hot air blowing couple second then turning to cold air.
    What is the problem
    thank you.

  11. Hi,

    I have a 2011 Ford Figo. the AC was working fine till last few days. Now, the situation is, I dont get cold air till I run for atleast 20 mins of time. After that 20, it cools well. I checked if its the case with blowing hot air as well. For hot air, the effect is immediate. But not for cold air. Would be glad, if you can help find the right issue.

    Regards
    Savith

    1. Savith,
      Thanks for your question about your Ford Figo. There may be a few problems causing your air conditioning not to work. The first possibility is that you have a low refrigerant level and it’s causing your air conditioning to take a long time to cool. A low refrigerant level would be due to a leak in the system. To seal your leak, add Blue Devil Red Angel to your air conditioning system to seal the leak, then add refrigerant to restore your air conditioning system to proper operation. You can purchase BlueDevil Red Angel here: http://bit.ly/L3fS0V.

      There are a few other problems that may be causing your air conditioner to malfunction. The first is the thermostat in your cabin. It will turn off the air conditioner if it thinks the cabin of the vehicle is below the temperature you set. If the thermostat is faulty it may be keeping your air conditioning from coming on. Also, if your AC fans are not coming on, it could be causing your air conditioning system to cool very slowly or not at all until your vehicle is driving at higher speeds. When you turn on your air conditioning, check to see that at least 1 fan is spinning behind your radiator.

  12. i have hyundai ELANTRA it is blowing hot air…
    i didnt switch in the ac, it is automaticaly blowing hot air.
    what to do
    suggest me
    please

    1. Arhaan,
      Thanks for your question about your Elantra. It sounds like you have a problem with your HVAC system rather than your air conditioning system. There is a door in the air ducts in your car that directs the air to either blow over the heater core, or ac coils causing the air to be hot or cold. It sounds like that door is stuck directing the ventilation air to blow over the heater core causing the hot air to blow.

      Depending what year Elantra you have, the door is most likely controlled by an electrical actuator. If this actuator has failed it may be causing the problem you’re having. Replacing that actuator can be difficult as it will be located behind your dashboard. It may be worth taking your car to a mechanic.

  13. I have a 2004 Chevy Tahoe that intermittently blows hot air when the A/C is on. I hear a clicking sound for a few minutes and then the hot air comes out. Just by accident, I found that if I pull over and turn the car off and then turn it back on, the A/C resumes. Any ideas of what is causing this problem?

    1. Valerie-

      First, the air conditioner may not be the problem. Some cars have a shut off feature that will disengage the a/c compressor if your engine is under duress. This typically happens if the engine is too hot, so be sure to check the engine temperature. If it’s hot in a situation of car air conditioner blowing hot air , then it’s an engine problem. If this is the case, you may want to visit your mechanic sooner than later.

      If that is not the case then it may simply mean you have a freon/refrigerant leak. If it is, in fact, a leak in your a/c system then we recommend using the Red Angel A/C Stop Leak.

      -BDP

  14. I have added the stop leak and new freeon, and aircon still not cold, I checked the compressor and it’s working fine, checked the freeon again and the it’s still shows full. What can be the issue? Please help, thanks in advance..

    1. Jason-

      If you have checked that the compressor is running and you notice frost or condensation on the high pressure line from the condenser to the evaporator, but still no cool air is blowing out of the ducts inside the car (and the blower is working), the fault is likely a BLEND AIR door that is stuck in the HEAT position, or possibly a badly clogged cabin air filter that is restricting flow. Another possibility would be a fault in the automatic climate control system such as a ad interior temperature sensor or control module.

      Our recommendation would be to have the vehicle looked at by an A/C specialist.

      -BDP

      1. I have a 2000 Honda and it was not blowing any cold air. Long story short I changed the ac compressor and I added oil and 3 can of freon, all done by mechanic (all his suggestions). The car still does not blow cold air and it still has a problem that when the a/c is on the fan turns on for a couple seconds then turns off. Please help.

        1. Jose-

          Depending on what kind of car you have the system may actually be overfilled with refrigerant. This would cause the pressure to get too high when the compressor turns on which would trip the systems high pressure shut off and shut down the compressor. This would also stop your cooling fans. We would recommend having the system evacuated and the proper amount of refrigerant added by weight.

          Thank You!

          -BDP

  15. I drive a ’96 Plymouth Grand Voyager SE. Lately, when I turn the a/c or heat (all knobs are in the off position) there is still either hot or cold air that blows through the vents (depending on if the lever is set for cold or hot). There is no air that blows through the vents at a stop, but when going down the road, there is ice cold air like the a/c blowing, or, if I move it to lever to heat (with all buttons still off) heat, the air blows through like the heat is on. It never did this before. Any idea what is going on?

    1. Jen-

      It sounds like there is an issue with your climate control system. We recommend taking the vehicle into a certified mechanic to have it further diagnosed.

      Thank You for your question!

      -BDP

  16. I have a 2003 Toyota Highlander, the climate control is faulty but i also noticed when i refill the ac refrigerant, it leaks and does not stay beyond 3months.
    I will like to know if the climate control is responsible for the leak or if they are two separate problems?
    The probable problems areas to check for and also if there will be leaks even when the car is not on.

    1. Kelvin-

      The actual climate control would not be responsible for a refrigerant leak. It may act up due to the climate control being faulty but it should not be losing refrigerant from that alone. If you do, in fact, have a leak we recommend using the Red Angel A/C Stop Leak to help seal it.

      As far as the climate control being fixed you may want to bring the Toyota into an A/C specialist.

      Thank You!

      -BDP

  17. I have a mazda6 isport 2008 my a.c is blowing out what looks like smoke and leaves a small puddle of water under my car on the passanger side What can it be??

    1. Lisa-

      If it is humid outside then you will sometimes see a thin vapor/smoke coming from the vents because of the cool air coming through the vents.

      Seeing water drip from under the car when the A/C is running or has run is 100% normal. The dripping is coming from the evaporator; the evaporator has a drain tube that allows the condensation from the evaporator to drain away from the vehicle.

      -BDP

  18. I have a 04 Tahoe that blows hot air sometimes. When I turn it on it works but out of nowhere it will blow hot. I can turn car off then on and it will fix temporarily

    1. Joe-

      This has been a very common problem in Chevy Tahoe’s. The most likely cause is that one or more of the temperature mode door actuator(s) have failed. This will often result in incorrect air delivery or temperature coming through the vents.

      We hope this helps!

      -BDP

  19. I’ve the Ford Fiesta ZXI 2007 model is not blowing cold air when I switch on the AC and getting noise in re circulation mode. what could be the cause and why the AC stopped suddenly and blowing hot air.

  20. I have a 2006 cheverlot equinox when I turn the ac on you can hear the compressor kick on than turn right off,than it just blows out warm air. If it real cool outside the ac is somewhat cool but still not what an ac should feel like .most of the time the air is warm. I refilled the coolant in the car because the engine was running hot but it only made the air from the ac change slightly but it’s still warm. Could my compressor be going out or do I just need to add freon to my car?

    1. Jessica-

      If the Freon is low enough then the compressor will not always kick on. We recommend having the Freon level checked, if it is not low then you are probably going to need a new compressor. If it turns out it is low, then you probably have a refrigerant leak.

      If it is a leak then we recommend adding a can of the Red Angel A/C Stop Leak and a full recharge of R-134a behind it. This should stop the leak and prevent any future issues with your A/C.

      -BDP

    1. Mona-

      If the compressor is still kicking on then most likely it does not need to be replaced. The first thing we recommend that you check is the condenser; it is possible that it is either clogged, dirty, or possibly needs to be replaced. The other possibility is a blocked or broken cooling fan.

      Both of these issues are fairly easy to fix and will hopefully get your A/C back to blowing cool air.

      Thank you!

      -BDP

      1. My hyundai accent 1.6 was start and I am sitting in the car and the ac is also works well but suddenly the blower flows hot air so what’s the problem

        1. Norman-

          There are quite a few things that can make your AC stop working all of the sudden but the most likely cause is actually an electrical issue. Your AC system has a few sensors in it that will shut things down if the pressures or temperatures get too high. It seems most likely that one of those sensors has malfunctioned and shut down your system. These can be difficult to diagnose so it may be worth taking your car to a mechanic for help.

          Thank You!

          -BDP

  21. I have a 1998 Honda civic. I do not have a leak and I put freon and my ac is still blowing out warm, what is wrong with it?

    1. LeRoy,

      Thanks for your question about the AC in your Civic. If you are sure you do not have a leak and your AC is still blowing warm then you have a problem with your compressor. For info about your air conditioning and how your AC compressor works you can check out our article about it here: https://www.gobdp.com/blog/air-conditioning-work/.

      There are two main reasons your compressor may fail. First, the electrical signal going to it telling it to turn on may not be getting to the compressor. This could be due to a blown fuse, a broken wire or loose connection. The other possibility is that the clutch on your AC compressor is worn out and no longer engaging the compressor. If you can prove your AC compressor is getting the 12V signal to turn on, and you are sure you do not have a freon leak then it is time to replace your AC compressor.

      Thanks again for your question and please let us know if you have any other questions!
      -BlueDevil Pro

  22. I have a 2000 Chevy Impala with a 3.4 engine. My problems began about 3 months ago with the fan not coming on for positions 1 through 4 but came on for position 5. This is the list of things I have changed in order to get things back to normal. Initially I changed the blower motor resistor ( twice ), Blower motor did not come on at all after that. Then I changed the blower motor. That wasn’t it either. I changed the heat/AC control assembly switch. Still fan not coming on. Then I changed the connectors for the resistor and the fan motor and the connectors to the back of the heat/ac control assembly switch. The fan began to come on after that but only on position 5. This wasn’t so bad because at least I had ac working but only on position 5. Now when I turn the fan on to start the ac, all I get now is hot air. Now with the three components of the ac system replaced and I’m still in the same bind when I began this ordeal. When I push the ac button a light on the button would illuminate. Now the light stays off when I push the ac button. I’m completely lost now. Any advise would be great.

    1. Rodney-

      Thanks for your question about your 2000 Impala. It sounds like you are having a nightmare of an electrical issue. Since you’ve changed everything else, it sounds like there is a short in the wiring either from the wiring harness to the switch, or from the switch to the resistor. The only way to diagnose that problem would be to test continuity on all the wires between the resistor and the fan switch and check for proper voltage running into the switch.
      For your air conditioning, since the light is not even coming on when you press the air conditioning button it sounds like that is a separate problem. There could be another electrical short between the AC button and the compressor, your compressor could be malfunctioning, or you could be low on refrigerant. To test the electrical continuity, find the one wire going to your AC compressor and test it for voltage when you turn the switch on. If you have 9-14 volts, then the next step is to try testing the pressures in the system to make sure you have enough refrigerant. If you find low pressure in your system it is an indication the refrigerant has leaked out and the system is keeping the compressor from coming on to protect it. First, add BlueDevil Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to your system to seal the leak. Then add R-134a refrigerant until your system is at the proper pressure.

      If you still don’t find a problem with the signal going to the AC compressor, or the refrigerant pressure, you likely have a faulty AC compressor or pressure switch in your system and it is best to have it looked at by a mechanic to help you find the problem.

      -BDP

  23. Hello BDP,
    I have a 2009 Toyota corolla LE. ABout a week ago i realised my AC blows less cool air through the vents on my side(driver side). The vents on the passenger side seems more colder than mine. The compressor works fine,i suppose?
    Could it be a blockage in the vents on the driver side? or a Blower problem?
    Thanks

          1. Hello BDP, My toyota Ac works well now. Servo was checked to be working well. Was told system was low on r134a due to leakage. Leakage has been restored now.
            However when driving intermittently AC stops blowing cold air while driving, it starts only after i turn it off manually and turn it on again.
            Could it be due to an overcharged system?

  24. 2005 Equinox.. driver side vents r blowing warm air while the passenger side is cold. We checked the actuator under the dash and it’s working properly . Got a Gage and checked the freon levels r good. Compressor is kicking on like it should. Any idea why the drivers side vents don’t blow cold?

    1. Tonya-

      We recommend having the actuator re-checked. When heat is only coming out of one side that is almost always the culprit. This is a fairly common problem with the Chevy Equinox.

      Thank You!

      -BDP

  25. My car was low on freon so i went and put some in, I wasn’t paying attention and overloaded it and now the ac only blows out hot air instead of cold, what should i do?

    1. Kevin-

      You should have the vehicle taken to an A/C specialist right away. Overcharging the system can cause the compressor to be overworked and will put a large amount of pressure on all components which may eventually cause a component to give and start to leak out.

      -BDP

  26. I have taurus 2014,
    the air condition when it on blows cold air in few second then hot air longer than cold air time. the freon full. I tried to open pressure switch sensor and return it bak again the blowing cold air become longer but with in minute return back ( cold air for few second then hot air is longer.
    could be the switch not work, regulator of air or the compressor
    Thanks

    1. Bandar-

      Thanks for your question about your 2014 Taurus! If your vehicle is still under warranty, the best thing to do would be to take it back to the dealership as this problem should be covered by your warranty.

      The problem you are describing doesn’t sound like it has to do with your air conditioning system, but actually your ventilation system. Your ventilation system is what controls whether hot or cold air will blow from your vents. There is a small door that directs air either through your heater or your air conditioner that is controlled by a solenoid. It sounds like that solenoid or the wiring is faulty causing the door to change from AC to heat without your control. We recommend having a Ford dealership look at that problem as it is very specific to your car.

      Thank You!

      -BDP

      1. I have Mazda 3 2008 and it start.cold for.a few minutes then turn hot for 20 minutes or more, the compressor is switching off….. And in the extremely hot day as today 42c it didn’t bring any cold air…. And I was melting

        The freon is good
        ………….
        Please help me with this. And thanks in advance

        1. Ahmed-

          Thanks for your question about your Mazda 3’s air conditioning. Your system has a high pressure safety feature that will shut off the compressor if the pressures get to high in your system. It sounds like that is what it happening to you. The warmer the day is, the higher the pressure will get. High pressure situations are usually caused by a system that is over filled with refrigerant or by clogs in the system. You can tell if your system is overfilled by using the pressure gauge on a can of refill refrigerant available at your local auto parts store. If the pressure is too high then your system is probably overfilled. You can check for a clog in your system with a set of AC gauges to measure both the low and high pressures in the system before and after each component. If you see a pressure spike followed by a drop anywhere but at the expansion valve then you’ve found your clog.

          -BDP

  27. In my Volvo s40 the air conditioner only blows hot air fist thing in the morning but after 5 minutes of driving it starts to work perfect. but if I just stay in the drive way with the engine on the air will only blow hot air. Its as if the compressor only work after the car is driving for a few minutes. can someone help?

    1. Stuart-

      Thanks for your question about your Volva S40. It sounds like the problem may be with your vehicle’s fans rather than the AC system. Your air conditioner uses the condenser in the front of your vehicle to cool down the compressed refrigerant in your air conditioning system before it can go through the expansion valve and cool your vehicle’s cabin. If no air is flowing over the condenser then the refrigerant won’t be cooled and your AC won’t work properly. While you are driving, air is being forced over the condenser by the motion of your car which makes your AC work properly. While you are parked or your car is idling, there should be an auxiliary cooling fan that turns on to create this air flow. Try checking to see if that fan turns on when you turn the air condition on. If it doesn’t, it may be a blown fuse, a bad fan relay, or a burnt out fan.

      -BDP

      1. My 2006 Volvo s40 air conditioner is also not working properly. It will blow cool air sometimes while driving and then all of a sudden start blowing hot air. I have taken it to a garage to have Freon put in it. It seems to work until I go on a longer trip. Can you advise me?

        1. Patty-

          Thanks for your question about the air conditioning in your Volvo. If you’ve had your Freon refilled, then you must have a leak in your system. We recommend using BlueDevil Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak first, then have your system refilled with the proper amount of refrigerant. If you are still experiencing problems after your leak is sealed and they continue to be intermittent, then it seems like you also have an electrical issue like a bad pressure or temperature sensor as well. These are hard to hunt down and also best to have a mechanic diagnose.

          -BDP

      2. Hello, seems I have same situation here in my Mitsubishi Pajero 2009. While running, the AC is blowing cool but if idle, after about 15mins., it start to blow hot air.I checked the condenser fan and it’s not turning. But everytime I switch off and on the engine and on the AC too,AC okay again and the fan is turning. Only after sometime at idle, the fan stop and looks like the compressor/engine tries to start turn the fan but it couldn’t.(I heard there’s like an engine sound that tries to start up the compressor but it’s stopping. Sorry couldn’t explain the sound better). Kindly what could be the problem. Fuse okay and Freon already filled. Thank.

        1. Junnifer,

          Thanks for your question about your Pajero. It does sound like the you’ve got a bad cooling fan. Even if it works for a while and then shuts off its sounds like the motor is on its way out so we would suggest replacing that fan and seeing if that solves your problem. There is a slight chance that the problem is the fan relay so you can try checking that the next time the fan shuts off.

  28. I have 08 Honda accord. A/C blowing hot air. I had my system and freon level check at a local mechanic and was told that it’s an electrical issue. could it possibly be just a blown fuse or maybe worn out relay?

    1. Mark-

      The A/C system in your car consists of lots of wires that are complete with fuses, relays and switches that work together to provide proper operation. If something disrupts even one of these connections the A/C system will not function properly. In your case it sounds like either a loose wire, bad fuse, or another connection is not allowing the AC & Heat switch to move back and forth. Whether it is a broken wire, short in the system, or something else we recommend taking the Honda to a local dealership or trusted mechanic. Without the proper equipment it will be very difficult to isolate the problem.

      Thank You!

      -BDP

  29. I drive a 2002 Jeep Liberty. I had the a/c compressor replaced. About a month later I had the radiator replaced. Since the radiator work was done the air does not blow cold. Could the replacement of the radiator have drained the Freon or should I be worried about another bigger problem?

    1. Angie-

      The replacement of the radiator really would not have any effect on the A/C system at all. It is possible that you have a refrigerant leak and coincidentally the Freon became low around the same time the radiator was replaced.

      We recommend adding a can of the Red Angel A/C Stop Leak (http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) and then following it up with Freon to recharge the system to its proper level.

      Thank You!

      -BDP

  30. hello I have a 2000 mercury mountaineer when you turn on the ac the compressor makes a clicking noise I checked the clutch and it is spinning but still clicks checked and added fron still no ac and clicking noise.

    1. John-

      Thanks for your question about your Moutaineer. A low Freon level could be causing your problems so it might be worth having the pressures in your system checked. If you find low Freon, make sure you add BlueDevil A/C Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to make sure you seal the leak and you don’t end up with a low refrigerant level again. If you find the high pressure side of your air condition system has low pressure then you may need a new compressor. The clicking may also be caused by a loose electrical connection to activate your compressor. The clicking may be the compressor turning on and off quickly. Check for loose wires on or around the compressor to see if that is the problem.

      -BDP

  31. I have a 2003 f250 . When I stop and put the truck in park, my ac works fine. When I actually start driving it goes completely hot. I am out of ideas as to why.

    1. Jessie-

      It sounds like you have a vacuum line leak somewhere in your HVAC system. The vacuum line may need to be replaced.

      We recommend having it checked out by an A/C specialist or Ford dealer.

      Thank You!

      -BDP

  32. Hi my name is Andrew and I have a 2008 cadilac dts my air blows cold on driver side but warm on passenger side whatcould b the problem

  33. Hi,

    I have a 2008 Honda Civic and one day my AC completely shut off, not blowing any air. I replaced the motor blower, which got the AC working again until it blew warm air at red lights. It would begin to blow cooler air at higher speeds but it would become warmer when I stopped. I recharged it and checked my AC clutch relay, which is fine. Refrigerant levels are good too. Also, another time I was driving I heard 2 noises as if pressure was being released (like a “pffffft pffffft”). Any idea what the problem is? Thank you ahead of time and I appreciate the help!

    1. Erin,

      Thanks for your question about your 2008 Civic! It sounds like you’ve checked all the right things to make sure your air conditioning system is working properly. One of the keys to your AC working is that air is blowing over the condenser in the front of your car to cool the hot, pressuriesed refrigerant. If the refrigerant doesn’t get cooled in the condenser, then when it goes through the expansion valve it won’t cool below ambient temperature causing your AC to blow warm. While you are driving, your car’s movement forces air through the condenser, but when you are stopped a fan is needed to pull air through the condenser. It sounds like your fan isn’t coming on which may be due to a bad fuse, a bad relay or bad electrical connection. The fuse and relay should be labeled in your fuse block in your engine bay so you can check those there.

  34. 2004 honda civic..hot air issues and tried freyon first, eventually got AC compressor last May and then it was working fine for summer. Tried AC today and its hot air again. easy fix or should I drive this car into a lake haha

    1. 2000 mitsubishi galant ac blowing hot air and when i connect the frein to recharge it in the low pressure line it blow air out instead of sucking the freon

      1. Adrian,

        Thanks for your question about your Galant. It sounds like you just didn’t have a good connection on your can of refrigerant to your low-pressure port on your system. Make sure both of the connections are in good shape and not damaged or bent. If you’re sure everything is fine, then the pressures in your system are too high and it may be over filled. The only way to tell for sure would be to have your system completely evacuated and then refilled with the correct amount of refrigerant.

  35. Hi Iam using hyundai elantra 2006 crdi from last week after summer started AC cooling is low when standing traffic and also its take time to cool and cooling is good in evening time only problem in traffic …wat will be the problem? ???

    1. It is very possible that you have a refrigerant leak in your A/C system. We recommend adding the Red Angel A/C Stop Leak and then having the A/C system fully recharged to the proper level. This should stop any leaks that you may have and get your refrigerant level back to the proper mark which will in turn get your A/C working as it should.

      Thank You!

      -BDP

  36. I am driving a 99 ford Expedition, the problem I am having is that when it is cold outside my heater blow cold and when it is hot my air blows hot air, can you please help me figure out why my ac blows whatever temperature that is outside. My air is HOT!!!!

    1. Felicia-

      It sounds like you need to have the temperature blend door actuator replaced. It is actually fairly common for these to fail or malfunction in Ford Expeditions.

      Thank You!

      -BDP

  37. hi iam having Hyundai elantra 2006 crdi model from last week ( after summer starts ) iam facing probelm with Cooling when iam staning in the traffic but its is k when moving…. what will the problem?

    1. Srini-

      There are a number of possibilities that can be causing your engine temperature to rise when sitting at an idle. Some of the most common causes are a bad fan clutch, or a clog somewhere in the cooling passages due to old antifreeze or other buildup in the system that can happen with age.

      We recommend first having the cooling system flushed. This alone may alleviate the problem and get your Hyundai back to its normal working condition. If it does not then you may want to have the fan clutch looked at and possibly replaced.

      Thank You!

      -BDP

  38. I have a 2007 Honda Fit and my A/C seems to have a mind of it’s own. It comes on when it feels like, but mainly when the outside temperature is not over 80 degrees. The compressor randomly kicks in when the A/C is on. I also noticed that only 1 fan is spinning when the temperature is hot. If it is the condenser fan, how do I test to see if it’s defective?

    1. Ricky-

      Thanks for your question about your 07 Honda Fit! The compressor in your vehicle will cycle on or off as need to keep pressures in the operating range in your air conditioning system. If the air is blowing cold in your car, then it sounds like everything is fine and the compressor cycling is normal.

      As far as the fan goes, with the AC on and your car warm and idling, both fans should turn on intermittently to keep the coolant temperature in the operating range and your air conditioning functioning properly. If one fan isn’t working it is most likely due to a malfunctioning rely. You can try switching the two fan relays if they are the same size and seeing if the other fan now operates. If that is the case, replace the faulty relay and you should be back to normal.

      -BDP

  39. Hi there, I have toyota vitz 2001, few months back my car AC was working fine, but since last few month I got recharge AC gass, as its got discharge due to leakage problem, at least four time I got recharge AC gass but know use, its again discharge, it seems its compressor isn’t working properly or reversing the gass, my mechanic told me may its cooling coil problem, its seems not correct, please advice what is may be the problem,
    thank you,

    BR,

    1. Hamdan-

      Thanks for your question about your Toyota Vitz. If you are regularly having to charge your air conditioning system then you definitely have a leak. It is possible that your leak is coming from the cooling coil, also called the evaporator. Once your system loses too much refrigerant the pressure is too low for the AC compressor to work safely so you car wont let the compressor turn on to help protect it.

      You can stop your system from leaking by adding BlueDevil Red Angel A/C Stop Leak available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/. Simply add Red Angel A/C Stop Leak to your air conditioning system through the low pressure port to seal the leak. Then recharge your system as usual!

      -BDP

  40. Hello, I have a 2002 ford explorer with rear a/c. I have taken my car to firestone 3 times already. They changed the compressor, the valve, the condenser, the drier, accumulator, the orifice and they flushed out the system. Could you help me in any way to see what’s possibly wrong? Thank you

    1. Yadi-

      Thanks for your question about your 2002 Explorer. It sounds like they’ve changed just about everything in your AC system and definitely the usual culprits of a broken system, so it seems like the air conditioning should be working fine. The two possibilities left are that a sensor in the system has gone bad telling the compressor to shut down. If a pressure or temperature sensor in the system is giving a false reading it could cause this problem. The other possibility is that the blend door in the rear ventilation system is broken. This is actually a relatively common problem on Explorers. There is a door in the vent system that directs the air over the heater or through the air conditioning cooling coils. If that door is stuck in the heating position the air will be cooled by the cooling coils then reheated making it appear as if the air conditioning is not functioning.

      Thanks!

      -BDP

  41. I have an old system on a 2000 Mitsubishi Mirage. U stopped the leaks and it is holding Refrigerant. The problem is weird. I can check the refrigerant level and it will appear low. But when i Replace the shrader valve it almost blew my head off. So I know it has refrigerant in it. But I can put some in and the next morning it will be blowing hot. I put more it and it works but the same prob. the next morning. Am I overloading the syst?

    1. John-

      Based on the extreme amount of pressure in the system it sounds like you may have a faulty expansion valve. The expansion valve is what converts the high pressure liquid refrigerant back into a low pressure gas into the evaporator. The expansion valve also meters the amount of low pressure gas that enters the evaporator. We recommend having this looked at by an A/C professional.

      Thank You!

      -BDP

      Thank You!

      -BDP

  42. I have a 2006 Hyundai Sonata, AC been working like a champ! 3 days started blowing mildly cold air but not how it would usually work. Please help thx!

    1. Manu-

      It is possible that your Hyundai has a refrigerant leak. We recommend adding a can of the Red Angel A/C Stop Leak and then recharging the A/C system to its proper level.

      Thank You!

      -BDP

  43. Hello! I have a standard 2000 Chevy Impala. A few months ago I noticed that the fan was blowing only hot air. I tried the temperature control knob but it wasn’t working. My AC was only blowing hot air. And when I say hot I mean HOT! When I turned the fan knob to the off position the fan wasn’t blowing as loud but hot hair still came out. It got so hot in the car I had to roll the windows down in the middle of Winter! My hubby replace the single climate control panel and the heater blend door about three weeks ago and it worked just fine. Until a couple days ago. Once again I’m having the same problems. But now there’s an electric burning “ozone” smell. Can you help me?? Thank you so much!! God bless

    1. TenaAnn-

      Thanks for your question about your 2000 Impala! It sounds like your husband did a great job in fixing the problem. As you described the original problem it sounded like it was the blend door that was the problem. Usually problems that happen back to back like this are related, so it makes sense that the burning smell you are smelling is also due to the blend door. The blend door is controlled by an electric actuator so it is possible there is a short in that electrical system or something causing it to stick. This same problem may be what caused the original blend door fail in the first place.

      Unfortunately electrical shorts are very tedious to track down. The easiest thing to do would be to remove the new blend door you installed and look for any sticking points or obstructions and to test the actuator without the door attached to make sure it moves freely and quickly.

      -BDP

  44. Hi, i am having hyundai Accent 2007, from few days i noticed that my car is giving ice cold air at the start after few miles of drive it start giving warm air, i noticed that ac clutch is engaged but still there is no cold air and even the ac pipes are warm but at the start they were chilled. What could be the problem i need some advice !!

    1. John,

      Thanks for your question about your Hyundai Accent! The problem could be coming from a few different places. First, your AC compressor may be starting to fail. If this is the case, then it is working at first, but as the pressure in the system rise to normal some refrigerant may be bypassing the old compressor causing the pressures to fall and warm air to blow. This may also be due to poor air flow over your AC coils. If the cabin filter in your car is clogged or dirty, the reduced air flow over the evaporator may be causing it to ice over reducing heat transfer and allowing warmer air to blow through the vents even if your AC system is working fine.

      You may also have a clogged expansion valve. If the expansion valve, sometimes called the orifice, is clogged it may produce a pressure and temperature drop for a short time then as the system operates the clog will slow the flow of refrigerant causing the system to fail. Lastly, you may have a problem with the cooling fan that is supposed to draw air through the condenser to cool it. This fan is by your radiator fan and should come on when you turn on your air conditioning. If you suspect the fan is the problem, try reading our article about diagnosing electrical issues here: https://www.gobdp.com/blog/engine-ticking/.

      If the fan isn’t the problem then the best way to diagnose the system would be to hook it up to a set of gauges to see what the system pressures do when the warm air starts to blow.

      Thanks again!
      -BlueDevil Pro

  45. I have a 2006 Chevy HHR and I just had my power steering pump replaced and now my A/C is blowing hot air! I checked all of the fuses, the motor turns on when I flip the A/C on, there is enough freeon and the hoses all cool fine. What else could it be?

    1. Gracie,

      Thanks for your question about your HHR. Our frist recommendation would be to take your car back to the shop that replaced your power steering pump and see if they will fix your AC. It sounds like the problem you are having is most likely due to a malfunctioning sensor in the air conditioning system. If the shop who changed your power steering pump forgot to replace a sensor or plug a wire back in it could cause your AC system to not operate correctly and cause the problem you’re having. We’ve found in most cases that when problems happen at the same time are somehow related.

      If that is not the problem, the other possibility is that the problem is actually in your ventilation system, not your air conditioning system. There is a vent door that directs air either over the heater or over your AC coils and if that has failed your AC would appear not to be working simply because your vents are not directing the air through the system properly. To find out if this is your problem you have to remove a significant amount of the ventilation system to find this door and ensure it moves and operates as expected when you flip on the AC.

  46. I have a Hyundai Santa Fe 2007. The A/C works fine and blows cold air while driving. The issue is that when the car is idle at a stop sign or drive through, it starts blowing warmer air. any idea what should i look at?

    1. Rizwan,

      Thanks for your question about your Santa Fe. The most likely problem you are having is actually an electrical problem, not a problem with your air conditioning. For a quick read on diagnosing electrical problems, check out our article about that here: https://www.gobdp.com/blog/diagnosing-electrical-problems/.

      In your case, there is a fan that is supposed to run whenever your AC is turned on to cool the compressed refrigerant in the condenser at the front of your vehicle. If this fan isn’t turning on then the refrigerant will stay hot and will not cool below ambient temperature when it goes through the expansion valve. When your car is driving there is enough air passing over the condenser to cool the refrigerant so your AC works properly. You can start by checking the connections to this fan, the relay, and the fuses.

  47. I live in Cali where it is always at least warm. When it’s 65- 80 degrees my a/c works great, ice cold! when its over 80, especially if parked in the sun for an hour or two, my a/c will blow hot air even after driving for a while. Some days, when its hot and I’m driving, it will start out ice cold then switch to hot air. Turning car off, sitting car for 10 min in shade, then turning it back on doesn’t help.
    Suggestions?

    1. Kerry,

      Thanks for your question about your air conditioning. Usually, when your AC works for a few minutes then shuts off it is due to an overpressure condition in the system. The high pressure causes the compressor to shut off to protect itself. The high pressure could be caused from too much refrigerant in the system or a clog. If your system is clogged, the most likely locations are the condenser, the dryer or the expansion valve. To determine which component is malfunctioning, you would need a set of high and low pressure gauges to test the different components. It is also possible that a pressure switch in the system is malfunctioning causing the compressor the think the pressure is too high even if it’s not. Testing these components is a tedious process and probably better mechanic that can do electrical work.

  48. I drive a 97 Chrysler Town and Country and sometimes my A/C blows cool and other times it blows hot. I cannot get it to switch from floor to defrost, etc and I hear a hissing sound at times. I figure it’s an electrical issue as this vehicle has had it’s share of electrical issues in the past with the ignition, and alarm system. Can you please sorta lead me in the right direction, and also can you tell me if this model has vacuum lines that switch the floor/defrost over? Thanks so much in advance.

    1. Judy,

      Thanks for your question about your 97 Town and Country. The Town and Country you have does not have any vacuum lines controlling the floor/defrost vents. The model you have actually has a computer controlled ventilation system that is known for being quirky and hard to deal with. The best thing for you to do would be to try reset or recalibrate the climate control computer. It is a relatively lengthy process, but here is the best description of how to do it we could find: http://www.2carpros.com/questions/1998-chrysler-town-and-country-98-country-climate-control-problems.

      Hopefully, your climate control system can just be reset. Since it is a computer controlled system, if resetting it doesn’t work, your only other alternative would be to replace the climate control computer.

  49. Hello, I hope I can speak with someone. I have a 2006 Ford Ranger, and it has ran great up to this point. I got in to use my AC on the first warm day of the year a few months ago, and the AC didn’t work, as in blowing hot air when on the cool setting. After I drove the vehicle for about 10 minutes, the car makes a “thump” noise, and then the AC starts to blow cool air. I am not sure what may be causing this issue. The AC worked fine last year, and the heater I believed worked fine as well. I only have they issue with the AC blowing hot air for the first 10 minutes or so, then the thump occurs, and cool air comes out. Any help would be greatly appreciated!

    1. Dylan,

      Thanks for your question about your Ranger’s air conditioning. Our best guess is that your problem is with your AC compressor or the AC compressor clutch. When your AC is switched off, or the compressor isn’t running, an electronic clutch is used to disengage the pulley from the compressor so the engine belt can still run. It is possible that this clutch isn’t engaging when you press the button, but only after you drive for about 10 minutes or so. This could be an electrical issue or due to a worn out AC clutch.

      If you check your AC clutch and it is in good working order, you may consider checking the accumulator next. Some different model Ford trucks have a service bulletin out for a thumping noise like you described and the recommended service is to change the accumulator but not the compressor. The bulletin doesn’t apply to your particular year truck but it may still help you find your problem.

      Thanks again for your question!
      -BlueDevil Pro

  50. 2004 toyota sienna. AC worked fine last summer. new radiator put in in Dec. tried ac today. blew cold for about 4 minutes then gradually changed to warm. turned it off. tried again 30 minutes later. same result.

    1. Sally,

      Thanks for your question! It is possible that your AC cooling fans simply aren’t coming on. Make sure once you press the AC button you hear the fans come on to cool things down. It is possible the mechanic who replaced your radiator didn’t reconnect the AC fans and that would cause the problem you are describing.

      Another possibility is that your AC system is reaching an over pressure situation and the compressor is shutting down. You would need a mechanic or set of AC gauges to prove this, but that is usually caused by either too much refrigerant in the system or a clogged component. If your cooling fans are working properly, the best thing to do would be to take it to a mechanic for a diagnosis.

  51. I have a 2001 Acura Integra. Stopped blowing cold air so I bought a recharge can and recharged it. It blew cold air for one day and then it went back to hot.

    1. Chris-

      It sounds like you have a refrigerant leak and that is why the recharge isn’t holding for you. We recommend adding a can of the Red Angel A/C Stop Leak and then adding the proper amount of refrigerant behind it. This will stop any leaks and allow your system to hold a recharge.

      Thank You!

      -BDP

  52. 2001 Honda Passport 4wd. When a/c is turned on it blows hot. When car is moving it gets cooler but high pitched grinding noise happens. When car stops it goes back to hot. It will occasionally cycle off while driving, but never really gets cold. Have tried to add freon but it will not take any and it says it is full too.

    1. Alyce,

      Thanks for your question about your Honda Passport. Grinding noises associated with your air conditioning system usually are a bad thing. It sounds like you might need a compressor, but you would have to check the pressure on the high-pressure side of your system to confirm that. It is also possible that your system is overfilled with refrigerant creating excessively high pressures which may be causing the noise and the lack of cooling. A mechanic should be able to check the high-pressure side and let you know if your system is overfilled.

      The fact that it does get cooler when you are moving but warms back up while stopped makes me think the condenser may not be getting enough air flow. The condenser is in front of your radiator and cools the refrigerant after it is compressed. If this doesn’t get enough air flow, the refrigerant is still hot when it expands through the expansion valve which allows it to never get very cold. this could be caused by debris blocking the condenser or a failed cooling fan or cooling fan relay. Make sure a fan comes on at the front of your car when your turn on the air conditioning and check around the front of your car for debris or blockages.

  53. Hi, I have a 2010 Camaro SS. My air conditioner is very random right now. It starts off and I turn on the AC. I could either get hot or cold air blowing out. The cold air will blow for a few minutes and then it will get hot again. If I drive the car long enough, it will get cool again.

    Any advice would be very helpful!
    Thank you!!

    1. Austin,

      Thanks for your question about your Camaro! It sounds like a lot of people have had similar AC problems with that year Camaro. Chevy is aware of the problems and has released a reprogram for the system and I believe a service bulletin. The best thing to do would be to call your closest Chevrolet dealership and give them your VIN number. They will be able to let you know what fixes are available and if they’ve been done to your vehicle already. Some of them may be able to be done at no cost to you.

  54. I had my ac charged it blew cold while I drove it back to work. I sat for about 15 mins and it did great. The car was turned off for about 4 hours, when I started it, it will only blow hot again. I can hear a slight hissing noise.

    1. Kim-

      Normally with a refrigerant leak we recommend using the Red Angel A/C Stop Leak. However, it sounds like you are dealing with a leak that would be considered fairly large. Because you are losing the refrigerant so quickly we recommend taking it to an A/C specialist to be diagnosed and repaired. The only thing that will stop a leak of that size would be to have the appropriate parts replaced.

      Thank You!

      -BDP

  55. Have a 2006 Chevy Express 4.8 V8 ac blows normal for a while then blows warm. this has been going on for two weeks. Replaced compressor a little over a year ago. could this be Ac regulator or switch if so where is it? Or freon needs recharge or leak?

    1. Daniel,

      Thanks for your question about your Chevy van! Any of the things you listed could be a problem. Your problem could also be a clog in your system or an overfilled system. The best way to figure out what the problem is would be to hook up your AC system to a set of AC gauges to check both the high and low pressures. If the low pressure is too low, then you need more Freon. If your high pressure is too high then your system is overfilled or there is a clog. If your high pressure is too low, then you may need a new compressor again. If all of the pressures are in the acceptable range, then this could also be due to a malfunctioning pressure or temperature switch in your system. Those are in a few different places and are difficult to diagnose without the repair manual for your vehicle.

  56. I have a 2006 PT Cruiser. My air just started blowing hot air. I have put in freon and changed the pressure cycling switch and nothing. The air blows out like it should it is just hot. What else could i replace or check before having to spend big bucks on a new compressor?

    1. Shannon,

      Thanks for your question about your PT Cruiser! besides a failed compressor, it may be that you have a clog somewhere in your system or that the compressor is not getting the signal to turn on when you press the button. If you can find the input wire going to your compressor you can check it for voltage when you press the AC button, but that can be difficult to do and dangerous to try with the car running. The other possibility is that you have a clog somewhere in our system. You can check that if you have a set of AC gauges. Look for higher than expected pressures before a particular component. In this case, you can also check the pressure right after the compressor to tell if your compressor is doing its job or not. If you find your high-pressure side isn’t high enough then you’re in the market for a new compressor.

  57. I have a 2005 Chrysler Crossfire. My air blows like I just have the fan on, maybe a little cooler at times. It blows like normal just not cold. What do you suggest.

    1. Ramon-

      You may be low on refrigerant. If it turns out that you are then we recommend adding a can of the Red Angel A/C Stop Leak. After the Red Angel has been added you should recharge the A/C system to its proper level.

      Thank You!

      -BDP

  58. Hi I have a 2001 Honda Civic, it has similar problems that I was reading in the previous comments, air not cooling until at high speeds, but when I checked the freon levels, it reads over pressurized. I’m not sure what to check next. Thanks!

    1. Cait-

      Thanks for your question about your Civic’s air conditioning. Based on your system being over pressurized that is most likely your problem. If the system’s pressure is too high then once the compressor starts to run the high pressure side reaches the limit and a pressure switch will disengage the compressor to keep the system safe and keep from damaging the compressor. Any shop with AC equipment should be able to safely evacuate the extra refrigerant to get you back on the road. Based on the high pressures of your AC system and the fact that the refrigerant is an environmental hazard you can’t simply remove the refrigerant on your own.

      The other problem you may have is a AC cooling fan that is malfunctioning. If fans don’t come on in the front of your car when you push the AC button them that could be causing your problem as well. If this is the case check your fan for free movement while the car is off, and check the fuse and relay for your cooling fans to make sure they’re working properly.

      -BDP

  59. I have a 2005 Scion tC and I am having a problem with my Ac . When I turn on my Ac it will kick out cold air and maybe after about 10-15 minutes the air is warm and then hot. I went to a mechanic and I was told to get a new Ac compressor, but I thought I needed a compressor if my compressor stopped working all together. I checked my reservoir and radiator and the coolant levels are full. What seems to be the problem? This is my first car and it’s a wee bit stressful

    1. Jojo-

      Thanks for your question about your Scion tC! Your radiator and coolant are not connected with your air conditioning system, so it’s a good thing they’re full, but unfortunate won’t help you diagnose your problem here. The only way to tell if you have a bad AC compressor is to use a set of AC gauges to measure the pressure right before and right after the compressor. If your mechanic did that test and found the wrong differential pressure across the compressor, he could be right in that you need a new compressor.

      It is possible for your compressor to be failing and still work for a few minutes. As your AC system continues to run the high side pressure will increase and plateau. Also, components will heat up and cool down causing expansion and contraction of parts which could affect their operation. It is possible that when the pressures are lower and the system is first turned on your compressor has enough power to cool the air in your car but after running for a few minutes the tolerances change and the pressure rise enough for it to stop working.

      You may consider getting a second opinion of your AC system just to make sure your mechanic accurately diagnosed the problem.

      -BDP

  60. I have a 2004 Chevy Tahoe that is blowing out hot air. The pressure switch is working and it is full of freon. The compressor lines are not getting cold. Any ideas.

  61. I have a 1991 BMW 535. My ac stops cooling whenthe ccar’s temperature reaches half and beyond. What may be causing the problem?

    1. Sheckles-

      Thanks for your question about your 1991 BMW 535. It sounds like you may have a bad temperature sender somewhere in your car’s cooling system. Your car has a safety feature that if your cooling system gets too hot it will shut off your air conditioning to help your car cool down. If the temperature switch that sends that signal is faulty, it may be shutting off your air conditioning even though your engine is not overheating.

      The other possibility is that your vehicle’s cooling fans are malfunctioning. There should be an auxiliary fan that turns on when your air conditioning is running to help cool the condenser and if it is not coming on the heat from your car warming up may be enough to cause your AC system to not work properly. You can check the fan for free movement and the fuse and relay to make sure it’s getting power.

      -BDP

  62. I have what I think is a very specific issue that I cannot find the answer for on the internet. And the issue doesn’t make sense to me.

    I bought a 2000 Tacoma and wanted to use the A/C. Whenever I turn on the A/C (or defroster since that kicks the compressor on), I get an odd whistling noise that can be heard in the cabin. I tried adding refrigerant with no success.

    Here’s the crazy part – I eventually realized that the whistling noise was the A/C system pulling a vacuum at the low pressure port! Somehow, there is a vacuum inside the lines that is pulling the low pressure port valve open and sucking air in. I have no idea what this means and makes my head hurt thinking about it.

    Any tips?

    1. Matt-

      During normal operation the low pressure port on your Tacoma should still be at 30-50 psi and the high pressure side much higher than that. Since you mentioned adding refrigerant didn’t work, the only thing we can think of is that you have a very large leak on the high pressure side of your compressor so any refrigerant you added was quickly forced out by the high discharge pressure of the compressor. If that is the case, there would be no refrigerant returning from the evaporator so the compressor would be drawing a vacuum on the low pressure line as it’s trying to pump refrigerant.

      To keep from damaging anything we would recommend not switching on you’re AC system until you get the problem fixed to keep from pulling contamination into the system and to keep from running the compressor without refrigerant or lubrication. Check downstream of the compressor for large holes like a disconnected or broken line or significant punctures in your AC condenser. Once you find the hole, replace that component and try to refill the system with new refrigerant.

      Thank You!

      -BDP

    1. Tremaine-

      Thanks for your question about your air conditioning! Different vehicles have different fail safes so we cannot say for sure if a broken fan will keep the compressor from coming on. In many cases, systems have a pressure switch that will shut off the compressor if the system reaches too high of a pressure. If the condenser fan isn’t coming on then the system will quickly over pressurize shutting off the compressor.

      -BDP

  63. I have a 2006 honda. The A/C was working fine, then all of the sudden it started blowing out warm air. When i first turn on the A/C it has cold air, then gets warmer and warmer. I don’t have a leak, and my A/C fluid was topped off, but it is still blowing out warm air.

    1. Joe-

      It is possible that your AC compressor is starting to wear out. Often times, old compressors will work for a few minutes but as they heat up things expand and move causing them to become less efficient. You can check this by measuring both the high and low pressures in your system to see if the compressor is creating the necessary differential in pressure for the system to work. The other possibility is that your cooling fans are not operating properly. Without cooling fans your AC system will work for a few minutes until the condenser gets heat soaked. Once the condenser is hot, you’re AC system will start to malfunction if the cooling fans don’t turn on.

      Thanks!

      -BDP

  64. I have a Subaru forrester 2009. When i drive my car, the AC works perfectly. When I stop the car at a red light or just parked, hot air starts to comes in with some kind of clicking sound from engine (might be from this belt that I have seen that rotates then just stops and rotates again which causes the clicking sound). Makes sense or do I sound crazy?

    1. David,

      It sounds like your having trouble with your electric fans. While you’re driving you have enough air flowing over the condenser in the front of your car to allow your air conditioning system to work, but when you stop, the lack of air flow causes the temperatures and pressures in your system to rise. You should have two electric fans that turn on when you turn your AC on to draw air over the condenser while your car is stopped to keep the AC working. If those fans do not turn on, your AC compressor will continue to compress the refrigerant until the system reaches the high-pressure cutoff. The clicking you are hearing is probably the compressor turning on and off as it reaches high-pressure safety point. If you don’t see the fans running when your AC is on you can check the fuses, relays and wiring for your fans.

  65. My wife’s 2012 Nissan Altima started blowing hot and I recharged it with R134a refrigerant. All was well for about 1 day. It started running warm again. I added more refrigerant with dye to detect a leak. The air stopped cooling as soon as the refrigerant can came off and 3 days later I looked for a leak with a UV light. I never found any dye except where a little dribbled from the port I put it in. I’m not sure where to go from here. Any ideas?

    1. Tim,

      Thanks for your question about your Altima. When using leak detecting dye, make sure you have your car in a very dark garage as the dye can be difficult to see unless you have a very bright black light. The other possibility is that the leak is in the evaporator which is under your dash. You’ll probably have to remove some of your dash and HVAC ducting to see the evaporator and the dye there.

      Instead of looking for the leak you can try using BlueDevil Red Angel A/C Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/?page_context=category&faceted_search=0) BlueDevil Red Angel is guaranteed to seal your leak without having to find it first and backed by our guarantee if you purchase it online or at one of our partnering retailers.

  66. My son has a 2006 PT Cruiser Touring Edition and his air blows warm when in idle but gets cool when he is moving. I bought one of those cans of refrigerant with the little gauge on it. When we hook it up it goes way up into the red that says “may have mechanical problems”. When the fan starts it then goes to yellow which says it is overcharged. Any ideas what might be the problem and should I still try to put some freon in the system. The car has 150,000 miles on it and these are all interstate miles and my husband never used the air before we gave it to our son.

    1. Stacy,

      The air conditioning problems with your son’s PT Cruiser are a little difficult to diagnose. It doesn’t sound like the problem is a low refrigerant level. Without measuring the high-pressure side of the system, it is hard to say for sure what the problem is but based on your description it seems the most likely problem is the compressor. It is possible that the lack of use of the AC system actually cause the seals in the compressor to deteriorate so it is possible that is your problem.

  67. I have a 1996 toyota camry. lately the ac works fine in the morning and at night and on days when it is cloudy, but when it is hot outside and you really want cold air, it feels like you have the heater running. We have added freon, but it was a waste of money since it is still doing the same thing. What could cause this?

    1. Jama,

      Thanks for your question about your air conditioning. It sounds like your system may be over charged. The warmer the outdoor temperatures the higher the pressure in your air conditioning system will get because the ambient air won’t be able to cool the condenser as much. Your air conditioning system has a high-pressure safety cutoff where it will shut down the compressor keeping the AC from working to protect the system. If you combine the high pressure of a hot day and the higher pressure of an overfilled system you may be reaching that cutoff point. Try having your system evacuated and refilled with the proper amount of refrigerant to try and solve the problem.

  68. AC not blowing cold air, grinding noise when AC is on and I stop and drive

    It does blows only hot air or external temperature, when stop at a light and drive off it does make a grinding noise, I tried replacing Freon and the needle of the indicator when pass the red zone to the black and did not move after that then did started to expel the Freon when the AC cycles making a noise.
    Got two different diagnostics, one says it is the compressor, the other says that the compressor works but did not have Freon and may have a leak.

    1. Fabiola,

      Thanks for your question about your AC not blowing cold. It sounds more like a problem with your compressor than just a Freon leak. If you are hearing a grinding noise associated with turning on your AC, then there is some internal damage to your compressor and even if it had the proper amount of Freon, it wouldn’t be able to do its job.

  69. I have a 2006 Pathfinder and the A/C is working fine when im driving but started to blow hot air when i hit traffic on the freeway or stop at the stop light. Any recommendation

    1. Jon,

      Thanks for your question about your Pathfinder. Most likely the problem is that your AC cooling fans aren’t doing a good job drawing air through the condenser when you’re in traffic. When you’re driving there is enough air flow from your truck moving to keep the AC working. Your fans might not be working due to an electrical issue like a blown fuse or broken relay, or the fan itself may be blocked or worn out. The other possibility is that your AC compressor is going bad and only has enough power when your engine is at a higher RPM. You can check your compressor’s operation by measuring the high and low pressures in your system using a set of mechanic’s AC gauges.

  70. Hot air from AC. Worked great last season. When attempting to add 134a freon, after connecting the filling hose to the low side, the needle on the gauge was pointing to the high Red Danger area. The car was running with AC on full. I still tried to add freon, but nothing released from the can. Do I have too much already in the system? I do not understand how this happen since it was working great last summer.

    1. Mike-

      We recommend taking your vehicle in to an A/C specialist. It does sound like the A/C system may be overfilled which can cause the failure of multiple parts. It would be helpful to have a professional hook up his gauges to better diagnose what is actually wrong.

      Thank You!

      -BDP

  71. I have a 2004 Buick Park Avenue Ultra with 97k miles. When I drive home from work in the afternoon, my AC is on. After the car warms up, cool air starts blowing out of the vents on the passenger side, but hot air continues to blow out of the vents on the drivers side. My drive home takes 30 to 45 minutes. The air stays hot on the drivers side the entire drive home. There are dual temperature controls in the front which are both set to cool.

    1. JJ-

      Thanks for your question about your Park Avenue. The climate control system in your car uses a series of motor controlled doors to direct air in your ventilation system. As these doors move they direct cabin or outdoor air over the heater core or straight through the ducts. It sounds like the air is being cooled by a properly functioning air conditioning system, but then the driver’s air is mistakenly being directed over the heater core as well. This is most likely due to a burnt out servo motor or a stuck ventilation door.

      Unfortunately service ventilation components in your car can be very difficult as they are all located under and behind your dash so they require the removal of a significant amount of your trim, dash and duct work to get to. If you’re confident and have the time to do that work, changing the burnt out servo motor or realigning the duct door is a relatively easy job.

      -BDP

  72. I have a 2004 honda crv the ac isint blowing cold like it should be but the ac pump dose engae when i turn on the ac what could be the problem

    1. Rodrigo-

      You may simply be low on refrigerant. We recommend adding a can of the Red Angel A/C Stop Leak and then following that up with a recahrge (be sure to fill the refrigerant to the proper level).

      Thank You!

      -BDP

  73. Hi I have a 2005 scion and I tried to recharge the air and it sounds like it comes back out I put some dye in ti to see if I could see where it is coming from I didn’t see anything would this stop leak help?

    1. Matisha-

      It is possible that the leak you are experiencing is coming from under the dash and that is why it is difficult to detect with the dye. We recommend adding a can of the Red Angel A/C Stop Leak to seal the A/C system and prevent any future Freon from leaking out.

      Thank You!

      -BDP

  74. Hello,
    I have a 2002 Nissan Altima and recently my A/C blows cold air when parked, but as soon as I step on the gas and drive it, it starts to blow hot air. What could be the problem?
    Thanks

    1. John-

      Thanks for your question about your Altima’s air conditioning. Your problem is opposite of what most people see in a failing air condoning system so it’s a little difficult to tell what is going on. The most likely possibility is that your system is experiencing an overly high pressure and shutting off the compressor to keep anything from being damaged. This could be from an overfilled system or a clog somewhere in your system. The only way to tell which your problem is to use a set of mechanic’s AC gauges to measure both the high and low side pressures. If the low side pressure is too high, your system is over filled and if the high side pressure is too high then you have a clog in your system.

      -BDP

  75. I have a 2006 Chevy equinox and my AC is blow warm. What is strange is when I get to 40 miles an hour the A/C blows cold again. I have check the Freon levels and they are good. I have checked the fuses. Any thoughts?

    1. Rodney-

      Thanks for your question about your 2006 Chevy Equinox. The problem you are having with your air conditioning sounds like a cooling problem with your condenser. If the high pressure, warm refrigerant that is running through your condenser isn’t properly cooled it won’t cool properly when it goes through the expansion valve causing your AC to blow warm air. When you’re driving above 40 MPH there is a lot of air flowing through you condenser since it is at the front of your car, so your AC works properly.

      This problem may be due to debris in front of your condenser or failed AC cooling fans. Check for debris behind your bumper in front of your radiator. Also check to make sure the fans come on in your engine bay when you switch the air conditioning on. If the fans don’t come on, check the electrical connects, fuses and relays for your fans. If your fans are working and you don’t have debris in the front of your car, then you condenser may be clogged internally and needs to be replaced.

      For a quick read on how your air conditioner works, check out this article: https://www.gobdp.com/blog/ac-working/.

      -BDP

  76. I have a 2007 Nissan Altima 2 months ago I had a new radiator put in my ac has not worked since but it was working before . Took it to the shop no leak it has Freon but the machine is not getting a reading when the ac is on. Is this an electrical problem.

    Thanks

    1. Tiffany-

      Thanks for your question about your Altima’s AC. If you are sure your system has the correct amount of refrigerant and you don’t get a pressure change when the system is turned on, then you either have an electrical problem or your compressor is broken. If you can find the electrical connection going to your compressor you can test it for a change in voltage or continuity when you turn the AC on. If you do not have a change in continuity or voltage at the compressor control wire, then you have an electrical problem. For a quick read on diagnosing electrical problems, check out our article about that here: https://www.gobdp.com/blog/diagnosing-electrical-problems/.

      In your case, the problem happened just after your radiator was installed it would be worth checking around your radiator for loose connections or broken wires. Also, your AC condenser is just in front of your radiator so it would be wise to check that for damage or any broken components or connections.

      -BDP

  77. I have a 08 Honda Civic and the AC goes on cold for about. 5 minutes when the engine has been off for a while. Then it will gradually get warmer until it is hotter then the air temperature outside. Then the AC will not go on again. I have noticed water does not drip from the bottom of the car, but the line was clear. The fans work fine, but the clutch only engages at startup up and won’t cycle back on after that. The levels of refrigerant are fine as well. Any ideas for me?

    1. Brian-

      It sounds like you’ve done just about all the right checks on your air conditioning system so far. The most likely possibility left would be that you have a clog somewhere in your system. As your system runs the temperatures of the refrigerant go up due to inefficiencies in the system and a reduced cooling load as your cabin air cools down. Your system has a high pressure shut off safety switch that will shut down your compressor to keep the system safe and from damaging the compressor. High pressures can come from a clog in the system, usually in the condenser, orifice tube or accumulator. You can use a set of mechanic’s AC gauges to measure the pressures around your system to determine where the clog is. The other problem that causes high pressures is being over filled with refrigerant. Sometimes the gauges on the small R-134a cans you can buy at the auto parts stores aren’t as accurate as they should be so you may try having your system evacuated and refilled with the correct amount of refrigerant.

      Thank You!

      -BDP

  78. I have an 04 mitsubishi lancer. The ac was working intermittently, and someone suggested I charge it. So my husband cleaned the intake and added a can to charge, but now the ac doesn’t cool at all. I can hear a strange buzzing noise from the dash when the ac is on, and ideas what I should check?

    1. Napier-

      Thanks for your question about your 2004 Lancer. Buzzing and other noises in the dash board is not an uncommon problem with the Mitsubishi Lancers so we don’t think that problem is related to your air conditioning not working. If your AC stopped working after your husband charged it, it is possible that your system is now overfilled and not turning on due to being over pressurized. Your system has pressure sensors that will keep it from turning on to keep the compressor from getting damaged. You cannot remove refrigerant from yourself, your best course of action would be to have a mechanic evacuate your AC system and recharge it with new refrigerant.

      -BDP

  79. Good day!! I have 350z and my problem is a little bit weird. I noticed that my ac wont blow cold air when my engine gets warm. Sometimes it does when my car is moving but when im idle it does not blow cold air. I checked the fan and the freon both are okay.. could it be the pressure sensor? Or i have to flush the coolant? Or what would it be? Thanks in advance and more power

    1. The way your air conditioning is working sounds like you may have an over pressure situation. If your low side pressure is too high, it could indicate your system is over filled which would cause a high pressure.

      Since your AC condenser is located in front of your radiator, it is unlikely that it is a cooling system problem or that a coolant flush would help the situation. Most likely your AC system is simply getting inefficient and having trouble cooling unless there is an excess air flow over the condenser, like when you are driving. To be sure, make sure your cooling fans are well connected to your radiator and have no gaps where air could be bypassing the condenser or radiator.

      If your system is getting inefficient it could be that you need to have your refrigerant evacuated and refilled to bring it back to the proper level and have the correct amount of oil. Your system may also be inefficient due to a clog in the system, most likely in the condenser or accumulator. You can use a set of mechanics AC gauges to measure the pressures around the system to determine if there is a clog at any component. Lastly, this could be an indication that your compressor is worn out and failing. You can check this by measuring the differential pressure across the compressor.

      Thanks!

      -BDP

  80. Hi there, we have 2005 Chevy Equinox. The AC blows nice and cold when we are driving down the road, but when we are sitting still, say waiting for wifey in the store, it blows hot/warm. This issue is bothersome as we have a child and blowing hot air is uncomfortable for everyone, especially children. Any advice on a fix would be great! I’ve heard horror stories of Equinox owners having continuous AC issues. I don’t want to be a statistic lol. I just want a permanent fix. Thanks so much in advance for your help!

    1. Tory-

      Thanks for your question about the air conditioning in your Chevy Equinox. The problem you are having is not unusual for the Equinox’s starting with the year you own. The most common cause is a loose electrical connection to the fans so they do not turn on, or don’t switch to high speed when the AC is turned on. Try finding the electrical connectors and unplugging them and checking them for corrosion or dirt. Clean them and reconnect them very firmly to see if your fan speeds change. The other possibility is that you are just slightly low on refrigerant. You can try adding R-134a yourself, or to be more accurate have the system evacuated and refilled with the proper amount of refrigerant.

      -BDP

  81. Hi! I have a 2010 honda civic and I am having problems with my AC. So 99% of the time it is blowing hot air. Sometimes hotter than the temp outside. If I hit a bump or I am stopped sometimes the AC kicks on and it is ice cold. Sometimes it stays that way for a few day sometimes only a few minutes. Sometimes it doesn’t get cold for days. It is very unpredictable and it may not even be the bumps that kicks it on. It could just be a coincidence because not every bump will do the trick. I checked my frion and it is fine. I haven’t taken it to a shop because I just don’t trust them and I have had way too many bad experiences. Please help!!! Any advice? Like I said when the cold works it’s freezing! But the fact that it’s unpredictable kills me! Especially when I need it the most!

    Thank you!

    1. Thanks for your question about your 2010 Civic! The air conditioning problem you are experiencing does sound strange, but our guess is that it is most likely an electrical problem. If everything works fine when it does work, it most likely isn’t a mechanical problem or a problem with the refrigerant, the problem is the system isn’t getting the signal to turn on until you go over a bump and it jostles things into place. For a quick read on diagnosing electrical problems, check out our article about that here: https://www.gobdp.com/blog/diagnosing-electrical-problems/.

      You can start by checking around your compressor for a loose electrical connection or by tugging and shaking wires around it to see if you can get the compressor to turn on and your AC to kick in. If you cannot figure out where the problem is coming from yourself, hopefully a mechanic can help you track down the loose connection.

      -BDP

  82. I have a 2004 Nissan Sentra SE-R Spec V that is blowing Hot air only. Checked the Freon levels and they are good. The compressor clutch is fully engaging. The Temperature control switch is working fine and switching from hot to cold as well. The condenser is clear of debris and seems to be fine as well. BOTH the high side and low side lines get extremely hot and there is no condensation or frost on any of the lines after a long time of running car with the A/C turned on. The only things I can think of are the expansion valve or the receiver/Drier have gone bad. I don’t want to take it to the dealer if I don’t have to. Any ideas on what could be wrong?

    Thanks,

    Ed

    1. Ed-

      Thanks for your question about your Nissan Sentra. It sounds like you’ve been checking all the right things to make sure the system is working correctly. The fact I’ll focus on is the lines are all hot. There should be two AC lines going into your fire wall, to your evaporator. Once line should be very cold and the other just ambient temperature. If both of those lines are hot then you are correct in that your expansion valve is not properly reducing the pressure and cooling the refrigerant in your system.

      -BDP

  83. Please help! I feel so stupid! Just bought a 2005 Equinox with only 33,800 miles. Riding home from purchase I notice that when I come to a traffic light, the AC starts blowing warm air. When I start moving, it gradually cools back down. I took it back and had them check the Freon and they said it had enough Freon. The dealer said that all chevy’s were like this in 98 degree weather. Is this true? I can’t afford a huge repair bill. Can you tell me what I can check? How can you rule out certain parts or determine what is truly the problem without getting ripped off?

    1. Susan-

      Thanks for your question about your 2005 Equinox. The problem you are describing is relatively typical of Equinoxes starting in 2005, so don’t worry! There are two major causes, the first being low refrigerant levels which you already had checked. It seems in these cars even a slightly low level can cause the problem you are describing so you can try adding refrigerant yourself, or having the whole system evacuated and refilled to make sure it has the correct amount in it.

      The other most common problem is that the electric fans that cool the AC system while you’re at a stop light are not coming on, or at least not switching to high speed. This problem is usually caused by loose electrical connections to the fans. With the car off and cool, find the wires coming from the fans and trace them back to a plug in connector. Unplug that connector and carefully clean both sides of dirt or debris. When you reconnect them make sure to push them as tightly together as you can.

      -BDP

  84. Hello,
    I have a 2005 Honda Civic I just bought a few months ago when it was cold outside and now the temps are getting really hot I tried using the ac and it blows cool when you are moving and it is not very hot out and then is blows hot when you are stopped or going slow and it is brutal…We have tested the fan and it seems to be running and we tried recharging with freon and the freon gauge suggests that it does not have to be filled and it is a mechanical problem…What do you think ? Please help its tooo hot!!

    1. Jennifer-

      Thanks for your question about your 2005 Civic! The usual cause of the problems you are describing is that you have a refrigerant leak and need to seal and recharge your system. If you are sure you have enough refrigerant, the fans are running properly, and your condenser isn’t blocked or damaged then the most likely cause of your weak air condoning is a clog in the system or a failing compressor. Unfortunately you need a set of mechanics AC gauges to determine what the problem is from here. If you have a set, you can test the pressure rise across the compressor. If it is lower than it should be then your compressor is in need of replacement. If the high pressure side is higher than it should be it is an indication that you have a clog somewhere in the system, most likely in the condenser or accumulator.

      -BDP

  85. I have a 2003 F 150 in my AC is not real hot but it barely blows cool enough to keep me from breaking out in a sweat if I didn’t have tent I’d be baking. The freon seems to be full and the compressor works but it kicks on and off every 15 seconds so if my compressor is working and my AC doesn’t need to be charged what could be the problem.

    1. Jason-

      The usual cause of the problems you are describing is that you have a refrigerant leak and need to seal and recharge your system. If you are sure you have enough refrigerant, the fans are running properly, and your condenser isn’t blocked or damaged then the most likely cause of your weak air condoning is a clog in the system or a failing compressor. Unfortunately you need a set of mechanics AC gauges to determine what the problem is from here. If you have a set, you can test the pressure rise across the compressor. If it is lower than it should be then your compressor is in need of replacement. If the high pressure side is higher than it should be it is an indication that you have a clog somewhere in the system, most likely in the condenser or accumulator.

      Thanks!

      -BDP

  86. I have a 99 grand prix and when the ac is on only cold air only comes out the right 2 vents and hot air in the driver side and middle vent. any suggestions??

    1. Thanks for your question about your 99 Grand Prix. The problem you are describing sounds like a problem with your dual climate control unit. There are two doors in your ventilation ducts, one that controls heat to the drive’s side and one that controls heat to the passenger. It sounds like the actuator that controls the driver’s side vent door has gone bad and has stuck that flapper door in the “heat” position. The other possibility is that the HVAC control unit itself is bad, but this is less likely.

      Unfortunately replacing this actuator can turn into a lot of work because a significant amount of the ventilation ducting will need to be removed. Nothing complicated needs to be removed, so if you work slowly and take a lot of pictures it can be a good do-it-yourself job.

      -BDP

  87. i have a 2005 chrysler pacifica its blowing hot air. I had someone put in a radiator because it was cracked. Now by him replacing that could there be a reason why my ac is blowing hot air?

    1. Q-

      Thanks for your question about your 2005 Pacifica. Your new radiator and warm AC may be related. Your AC condenser sits just in front of your radiator so it is possible that while replacing the radiator the condenser or one of its hoses or pipes as damaged and caused a leak in the system. The other possibility is that an electrical connector or sensor was unplugged during the maintenance which could also cause your AC to stop working. We would recommend you taking your Pacifica back to the person who did the maintenance and seeing if they can identify the problem.

      -BDP

  88. By reading many of the other posted questions I think my 08 Lincoln MKX (56h500 mi only) may have an issue with the condenser fan. When driving the ac works in our hot Palm Springs temps, but lately when I’m stopped and the car idles…whoo. It’s bad, no ac just blowing hot air. I don’t want to go to the auto repair with no education. Please advise.
    Thanks!

    1. Grace-

      The problem you are describing could definitely be caused by failed AC fans. You can try checking the wiring, fuses or relays to see if that is your problem. The other things that could make your system malfunction in the way you are describing is a slightly low refrigerant level, so it may be worth having your mechanic check that as well. Based on the number of miles on your car it is unlikely, but you may also have a failing compressor or a clog somewhere in your AC system.

      Thanks!

      -BDP

  89. My 2013 Hyundai Elantra was blowing cool air, but it wasn’t as cold as it used to be, so I added some 134A refrigerant to the system. After doing this, the car now blows hot air, not cold at all. What do you think went wrong? And how can I fix it?

    Thank you so much!

    1. Bodie,

      Thanks for your question about your Elantra. The most likely cause is that you accidentally overfilled your system with R-134a. If you add too much refrigerant the pressures in your system will get too high and it will shut itself off to avoid damaging your compressor or the other components. This would be indicated by your low-pressure side pressure being higher than usual for your car. In this case, the best thing to do is have your system evacuated and refilled with the proper amount of refrigerant to get it working again.

  90. Hi, I have a 2011 Honda CR-V and in the past two weeks, I’ve been having an issue with the a/c and temperature gauge. The a/c will only blow cold for 5 mins at a time and then blow hot air. If I turn it off and turn it back on, the same thing continuously happens. The temperature gauge stays all the way up to “H”. I’m not sure what the issue is and I don’t want to pay tons of money getting the run around.

    1. Bodie-

      Thanks for your question about your CR-V. The first problem we would recommend checking on is the temperature gauge being too hot. Operating your car with the engine coolant that hot can lead to a lot of damage and some really costly repairs. The first thing we recommend is to check your coolant level and make sure it is topped off. Make sure to check that when your car is cold so you don’t burn yourself. If you find a low coolant level, add BlueDevil Radiator and Block Sealer (available here: http://store.gobdp.com/radiator-block-sealer-00205/) to seal your leak, then top off your cooling system with Honda’s recommended coolant for your car.

      The problem with your air conditioning cutting off may have to do with the high engine temperature. Having your air conditioning running puts a lot of load on your car’s engine and cooling system, so many vehicles have a safety shut off that will turn that will turn the AC off if the car gets too hot to protect it from overheating. Try getting your engine back to a normal operating temperature first and see if that fixes your air conditioning as well.

      -BDP

  91. I have a 2012 chevy Malibu and the other day I got in turned on my ac and it started to blow out hot air and a clicking sound and seems like the car wants to die what could be wrong none of my gages moved no lights have came on.

    1. Brandy-

      Thanks for your question about your 2012 Chevy Malibu. The first thing we would recommend is to check and see if your car is still under a manufacturer’s warranty. It is possible that the problem you have is something a dealership could fix at no cost to you if your car still is under warranty.

      The only way we can see your AC, a clicking noise and your car wanting to stall being related is if your AC compressor is failing mechanically and has internal damage. That would cause your clicking noise and make the compressor harder to turn which would lug your engine making it want to stall. That is a pretty extreme scenario and unusual for such a new car. You could check for this using a set of mechanic’s AC gauges and measuring the high and low side pressures across the compressor. If the compressor is broken, it will show a lower than usual pressure rise and a low high-side pressure.

      It is also possible that these are unrelated. Your car wanting to stall could be fixed with a simple tune-up so try checking your owner’s manual for any routine maintenance items that may be over due. Also, diagnosing air condition problems can be difficult without knowing the pressures inside so it may be worth having a mechanic take a look at your air conditioning to help figure out what is going on.

      -BDP

  92. Hey I have a 98 Rav 4 and I just filled up with 2 cans of refridgerant yesterday and it is not blowing cold today. I had filled up about 6 months ago and it was blowing cold up until yesterday out the blue. My ac fan doesnt comeon and all my belts are spinning. I had a pressure reading after the 2 cans right at the limit to be ok but now when i measure it is reads nothing. Is this why my fan isnt spinning because the refriderant has leaked out or could it still be in there and just something wrong with the fan or maybe a fuse that wont start the AC. I cant imagin a leak that could drop 2 cans overnight. Thanks for any info.

    1. Kurt,

      Thanks for your question about your Rav4. It does sound like you have a pretty serious leak in your system. If the pressure has dropped back to zero then your compressor won’t cycle on due to the low-pressure safety cut off. If your compressor isn’t cycling on then your AC fans won’t kick on either. Before adding any more refrigerant, add BlueDevil Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal your leak. Once you’ve added BlueDevil Red Angel AC Stop Leak you can add more refrigerant to the proper pressure and get your AC back to normal.

  93. Hello, i have a small problem with my passat 98, only warm air comes out from the vents. What can the problem be, i have no A/C.

    Thankfull for any help.

    1. Mikael-

      It sounds like you may be low on refrigerant which normally means you have a leak in the system. We recommend adding a can of the Red Angel A/C Stop Leak and then add the proper amount of R-134a to recharge the A/C.

      Feel free to contact us at 888-863-0426 with any further questions.

      Thank You!

      -BDP

      1. thank you very much for your fast reply, i really appriciate it.
        I have to sy though that iI do not have any air condition in my car so it can be that i has to be something else I only have a normal heater.

        Thank toy BDP
        //Mikael

  94. Hey, a friend of mine has an older handicapped van and the front AC vents only blow hot air and the back blows none at all I’m thinking it’s a clogged condenser or no coolant at all would you know what it could be?

    1. Braydon-

      The first thing I would check is the refrigerant level. If it is low, or empty, then we recommend adding 1 can of the Red Angel A/C Stop Leak and following it up with the proper amount of R-134a.

      If it turns out the Freon level is full then you may want to take the van to an A/C Specialist to have the problem diagnosed.

      Thank You!

      -BDP

  95. Hi,
    I have a 2011 Honda CR-V that is overheating, leaking inside of my car/not holding antifreeze and only blows cold air (from a/c) for 4 minutes before starting to blow hot. In the winter time, it was fogging up in the inside. What’s the likelihood that it’s the heater core, or is it something else? I really don’t want to get the run-around from my local mechanics and waste money.

    1. All of the symptoms you have described would lead us to believe you have a leaking heater core. If you are looking for an option outside of replacing it then you could try using the BlueDevil Head Gasket Sealer. We have successfully used the product in the past to seal leaking heater cores.

      Feel free to contact our tech support team at 888-863-0426 with any questions.

      Thank You!

      -BDP

  96. Hello,
    I have a 2014 Chevy Cruze LT. My Freon showed that it was very low so I bought two bottles of Freon. After filling up to full my A/C cooler now blows out warm air. Did I do something incorrectly?

    1. Brandon,

      Thanks for your question about your 2014 Chevy Cruze. It is possible that you overfilled your AC with 2 bottles of refrigerant. If the pressure is too high in your system, like when it is overfilled, a safety switch will turn off the compressor to keep it from getting damaged. To solve the problem, you may have to get your system evacuated and refilled with the proper amount of refrigerant. Since your car is so new it may still be under warranty so you may consider taking it to the dealer for repairs.

  97. I have a 91 Honda accord. I have replaced the entire cooling system. When its very hot outside the car blows hot air. When weather cools the air blows fine!

    1. Jermain,

      Thanks for your question about your Accord. There are a few possibilities for your AC malfunctioning like you described. You could be having problems with your car’s cooling fans not being properly installed after your cooling system was replaced. If the fans are not properly installed and sealed against the radiator they won’t draw enough air over the condenser to keep your AC system functioning properly. This also could be an indication that your air conditioning system is overfilled and the excess refrigerant is causing an over pressure on very hot days which would shut your system off to protect it. Lastly, it is possible that your system has a clog in it somewhere that increases the pressure enough on a hot day to shut things down. Clogs are usually found in your condenser or the dryer.

  98. I have a 2011 Hyundai Sonata. The air conditioner stopped blowing out cool air. My husband tried adding coolant, but that did not help. The repair man is saying I have a leak in the core. The replacement and labor is quite expensive. Is there another option for fixing the AC?

    1. Nannette,

      Replacing the core is an expensive job simply because of how hard it is to get to. Instead of replacing the leaking component you can use BlueDevil Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak in your air conditioning system. Once the leak is sealed your can recharge the system to the proper pressure and you should be back in business!

  99. Hi! I have a 2004 Honda Accord and the AC was working fine until one day I started my car and the fan just stopped blowing. There’s no noise of fan at all not even the defrost comes on. Could it be that the fan just needs replacing?

    1. Cipriana-

      Based on your description it sounds like the compressor may need to be repaired or replaced. You should have it looked at by an A/C specialist to be diagnosed so that you are better able to weigh out any possible options.

      Thanks!

      -BDP

  100. Hi,
    I have a 2010 Chevy Impala.
    There are 4 AC vents on my dash board. just like any other car. The two AC vents on the drivers side blows hot air all the time. whereas, the AC vents on the passengers seat blows cool air and is working corretcly.
    What do you think is the issue with the vents on Driver’s side?

    Is it something that I can fix on my own or should I take it to a mechanic? How much would it cost to repair this?

    1. Srinivas,

      Thanks for your question about your Impala. It sounds like you are having an issue with your dual climate control. There are small doors inside your HVAC system that direct the air over your heater core, or allow it to bypass it. It sounds like the flapper door that controls the air flow for the driver’s side is stuck in the “heat” position while your passenger’s side is functioning properly. The problem could be due to a broken door or a worn out control motor.

      Replacing the door or the control motor shouldn’t be a very difficult job, but it usually requires the removal of a significant amount of your HVAC ducting and sometimes even some of your dash board to get to the components you need to replace. You should be able to accomplish all that with simple hand tools so if you take your time and label everything during removal, you should be able to accomplish it on your own!

  101. I have a 2011 nissan altima….AC blows cold if car has been sitting for a few hours, but as soon As i drive around town for like 15mins, Air blows very warm…..Clutch seems to work, condenser is free of debris, fuses all look good, no leaks, checked Freon( has plenty)… Please help

    1. Israel,

      Thanks for your question about your Nissan Altima. It sounds like your system is shutting itself off after a few minutes of use. In most cases, this is due to an overpressure situation in your AC system and is your car protecting the system from high-pressure damage. The unusually high pressure may be due to your system being over filled with refrigerant or a clog somewhere in the system. To determine which is the problem you’ll need to measure both the low and high side pressures in the system.

  102. 2008 PATHFINDER DOES NOT BLOW COOL AIR UNTIL ABOUT 20 MINUTES OF THE CAR RUNNING. AND THEN IT JUST DROPS TO 60 DEGREES ALL OF A SUDDEN. I have replaced the in cabin air filters and the radiator has been replaced within the last year as well. The pressures are fine according to the gauges. Do you have any idea what could be causing this issue.

    1. Matt-

      Thanks for your question about your 2008 Pathfinder. If both the high and low side pressures are reading within the acceptable range then the malfunction could be an electrical issue in your system or the fault could be in your ventilation system. If you have a faulty temperature or pressure switch in your air conditioning system, it could be causing your compressor to cycle less than needed to keep the air cool in your cabin. Also, if your ventilation system is malfunctioning, the blend door may be allowing air to pass through the heater core as well reheating the air and making it feel like the AC isn’t working.

      -BDP

  103. On a cold start my AC works fine. After I reach a destination, say a gas station I get back in my truck and find that the AC will not blow cold air. Now I can drive several miles with no issue and this does not happen all the time. Also I noticed that sometimes my selector will automatically switch to where it blows out of my defrost. When the AC stops working I can let the truck sit for a while and it is back up and running normal. Is there any chance that I could have a bad high pressure switch? I already changed the low pressure switch last year. Also this mostly happens on really hot days. Truck is a 1999 Chevy Silverado 6.0

    1. Arlan-

      A bad high pressure switch could cause the problems you are having. If everything is working normally until you park it for a short time, heat soak in your engine bay could raise the pressures in your AC system enough to trip a faulty high pressure switch. If you’ve recently added refrigerant it is also possible that your system is actually over-full and the pressure is indeed getting too high causing the shut off. Also, make sure your condenser cooling fans turn on and work properly when you turn on your air conditioning to keep things properly cooled.

      As for your selector switching automatically switching to defrost, it sounds like you have a short in your ventilation control panel. There is a slight possibility that this short is also causing your AC to turn off so it might be worth looking into that issue first to see if it will solve both of your problems.

      Thanks!

      -BDP

  104. I have an 98′ Isuzu Rodeo V.6 and I too have the problem that many are having. The air blows out warm (even hot, depending on the weather outside). At first, a gentleman put freon and the air was blowing cool and him and I left my car alone. Then there was a shortage on one of the fuses that connected to the A/C. A few months later, I placed two fuses and they too burned out. I put freon and the freon did not want to go through the pipes. I’m wondering what other options are there?

  105. I have a 2008 pontiac g6. A year ago my check engine light came on and I was told that I need to get my thermostat replaced. I never got it replaced, Months later my air conditioner stopped working. It would blow hot air and not get cool. So i got my ac condenser replaced. My air worked for a minute and then went out again. I started to notice the temp gauge would sometimes move even with not having my thermostat replaced and my air would work, and some days the temp gauge wouldnt move at all and my air would not work. What do I need to do?

    1. Amber-

      It is hard to tell if your problems are related, but it is possible. If your car is overheating it will switch off the air conditioning to help keep things cooler so that may be the problem you are having. When your car runs hot it can create scale and precipitation in your cooling system so we recommend flushing your cooling system to make sure it is working at its optimum performance by using BlueDevil Radiator Flush (available here: http://store.gobdp.com/radiator-flush-00204/). Once you’ve cleaned out your cooling system, replace your thermostat and add fresh coolant.

      If that doesn’t get your AC to start working like it should, then you may also have a leak in your air conditioning system. You can prove this by measuring your low-side pressure. If the low-side pressure is lower than expected then your system is low on refrigerant. If this is the case, use BlueDevil Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal your leak and get your AC back to working like it should.

      Thank You!

      -BDP

  106. This site appears to be extremely helpful. We recently bought a 2000 Mercury Cougar for my daughter. The A/C will blow cold air and at random times, the cold air will switch off. Sometimes you get in and get cold air, and sometimes you get in and get hot air. There are no noises, there is no pattern to the cold or hot air. You can fiddle with the A/C knobs, switch from Max A/C to defrost and nothing happens. It appears to be totally random; you never know whether you will have cold air or warm air. We have already taken it to a local mechanic and they installed an A/C seal repair kit. It hasn’t helped. It is still bi-polar. There is also a “Check Engine” light that has remained on that seems to be unrelated. (Has to do with the engine coolant temperature – P0118 and P0117). Any ideas or resources you can pass on would be extremely appreciated!!

    1. Carla-

      Thanks for your question about your Mercury Cougar. Erratic problems like you are experiencing are almost always due to faulty sensors or loose wiring. In your case, you may start with the error codes you got. They indicate that one of your car’s coolant temperature sensors is malfunctioning. Most cars today are designed to switch the air conditioning off if the car is overheating so if the temperature sensor happens to be reading higher than it should it could send an AC shutoff signal to your computer causing the lack of AC you’re experiencing. Try having that engine coolant temperature sensor replaced first and see if that solves your AC problem.

      If that doesn’t get your AC back working properly, then the issues is most likely a loose control wire going to your AC compressor or a faulty temperature or pressure switch somewhere in your AC system. Trouble shooting loose wires and sensors takes a lot of patience, so unless you enjoy that kind of work, you may be better off having your mechanic go through the diagnostic process.

      Thanks!

      -BDP

  107. Hey guy, ’08 Suburban blowing hot air. When I turn the AC on, the compressor/clutch kicks on and then off a few seconds later and repeats. I the checked refrigerant level which is good. Where do I go from here? Any help is appreciated. Thanks

    1. Thanks for your question about your 2008 Subaru! If the compressor cycles and you’re sure your refrigerant level is good, then it sounds like you probably have a clog in the system. Your compressor would run until the system reaches the high pressure cut off then the system will shut off the compressor to protect itself. As the system depressurizes the compressor would kick back on until it again reaches the high pressure cut off but wouldn’t run for long enough to cool the air. Unfortunately you need a high pressure AC gauge to measure the high pressure side of the system at each component to check for clogs. In most cases it is either the condenser or the dryer that gets clogged.

      -BDP

  108. I have a 2010 Jeep Commander….. the air condition stop blowing cold air especially from the vents on the passenger side. I do not have a dual control. Freon was added, and it slowly began to cool again, but still not as cold from the passenger vents. It returned to the same issue about month and half later. The compressor, and fans are all okay. What is causing this issue?

    1. Vicky-

      Thanks for your question about your Jeep. The problem you are describing sounds like a problem with your dual climate control unit. There are two doors in your ventilation ducts, one that controls heat to the driver’s side and one that controls heat to the passenger. It sounds like the actuator that controls the passenger side vent door has gone bad and has stuck that flapper door in the “heat” position. The other possibility is that the HVAC control unit itself is bad, but this is less likely.

      Unfortunately replacing this actuator can turn into a lot of work because a significant amount of the ventilation ducting will need to be removed. Nothing complicated needs to be removed, so if you work slowly and take a lot of pictures it can be a good do-it-yourself job.

      Thank You!

      -BDP

  109. Hello,
    I have a 2008 Honda Civic.
    My AC seems to be working relatively fine when driving around town at average street speed limits(40-45) regardless of how long I have been driving around town. I have a 2 hour drive between mine and my parents house on the open road highway where the speed limit is 75-80, and recently whenever I have been driving that highway for about 1.5 hours my AC stops blowing at full power and also isn’t blowing as cold as it should be. In my car, typically, when you turn on the AC to its maximum power, you get the normal kind of roaring sound that comes along with turning the AC up fully – but when it stops working properly, and you turn up the AC to its max, you don’t get that full power sound but you do get a sort of high pitched humming sound – almost like a lot of air traveling through a small hole, its a quiet sound but its high pitched. I should also say that usually, if I get to my destination, turn the car off even for maybe just 15 minutes (I haven’t yet tried turning off and then turning back on right away to test this yet), and turn it back on it seems to be working fine. I was trying to find someone with a similar issue and the few people that seemed to have an issue similar to mine said they took their car in and because it only happens after a few hours of operation, most places told them they couldn’t identify any problems. So I’m trying to see if there is anything I can trouble shoot maybe here before I take it in and pay all of these diagnostic fees. But I have made this drive many many times without this issue – I do live in AZ and its about 100-110 outside right now, not sure if that has anything to do with it. Any idea what might be going on?

    Thanks so much for any info you can give!

    1. Kristen-

      Thanks for your question about your 2008 Civic. Our best guess is that your evaporator is actually freezing up after a long drive. The moisture in the air condenses as it is cooled and if the evaporator is too cold it will freeze on the evaporator. Eventually the ice will cover enough of the evaporator that your fan will have trouble pushing air through it and the arm will blow slowly and be warm. When you park for a short time the ice can melt so your system will work properly.

      Most of the time your evaporator is freezing up due to a clogged water drain line or a clogged cabin air filter. Try changing your cabin air filter, cleaning the air intake by your windshield wipers and making sure the drain line is clear.

      Thank You!

      -BDP

  110. I have a 99 civic. My when i turn my air on it blows hot air. I have recharged it, but all it does different is make a hissing sound from the passenger side. Still hot! Everything seems to be working properly except the cold air!

    1. Justin-

      Often times a hissing can indicate a clog somewhere in your system. If you can hear it inside your car, you may check your evaporator or the dryer for a clog. If you’re confident your AC is working properly you may also check to make sure your air blend door is working properly in your ventilation system. If it is broken and stuck on the “heat” setting it could be reheating your air conditioned air causing warm air to blow from your vents.

      Thank You!

      -BDP

  111. Hi

    I just charged my ac 4 days ago and now it is again blowing hot air. The second issue is that when the car is idle, it blows hot air, but during evenings, the car ac is working fine as the north pole.

    So 2 issues,

    1. ac ran out after 4 days of full charge
    2. ac blowing hot air during hot days

    Pls help….your advise pls.

    1. Riakaina-

      It sounds like you’ve got a leak in your system allowing the refrigerant to escape after you add it. You can use BlueDevil Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak in your AC system. Once the leak is sealed you can refill it with refrigerant and be back to normal. It is possible that simply sealing your leak will get your system back to working both during the day and at night. If sealing the leak doesn’t get your system back to working all the time then your compressor may also being going bad. A bad compressor won’t be able to get the pressure high enough during the day when the cooling load is high but at night it may still be able to cool.

      Thank You!

      -BDP

  112. i have a 2008 ford focus, it is blowing warm air on the dirver side and cold on the passanger. Had the ac checked was low on r 134a they put in .75 lbs and noted no leaks. was cold for about a week and now that the temps are at 100 degress out side i can not get the car to cool at all. Driver side is starting to blow warn again.
    What can this be?

    1. Charlene-

      Thanks for your question about your Ford Focus. Usually when you get different temperature air from different sides of your car the problem is with your dual climate control system. If your car is equipped with dual climate control it may be the module, or the blend door for the driver’s side.

      The other thing that seems odd is if your mechanic didn’t find a leak in your system, why did he have to add more R-134a? If your car was low of refrigerant it had to be due to a leak. You can try using BlueDevil Red Angel A/C Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak, then have your system refilled and you won’t have to worry about it leaking out again.

      -BDP

  113. I recently replaced my ac from a store I Pl bought online. Paid the mechanic 290 to fix then two weeks later I got hot air again. Come to find out the ac had a leak in it. The mechanic is going to charge me 200 to installed the new one that’s was sent to me but I don’t have that kind of money to keep fishing out. So on attempt to save the new ac I bought. I got some leak stop and more refrigerant. Now only my passenger is cold and my went are trying to get cold. Do I have to replace my whole ac again. I drive a vw gti. Please help. Thanks.

    1. Jauna-

      Thanks for your question about your air conditioning on your GTI. If you have cool air on one side of your car but not the other the problem most likely lies with your dual climate control rather than your AC system. Try checking the ventilation control module or the driver’s side blend door and blend door actuator for proper operation.

      -BDP

  114. i have a 2000 hyundai elantra the ac blows cold only somtimes but more times then not it blows warm air and when it dose the car runs very rough i have tried the do it yourself recharge cans and it only woeks for a few days what could be the issue

    1. Greg-

      Thanks for your question about the air in your Hyundai Elantra. If recharging the system helps but is not permanent, then that is a good indication that you have a leak in your system. Try using BlueDevil Red Angel A/C Stop leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak, then recharge your system again, hopefully for the last time.

      You also said your car runs rough when the AC is on. This could be an indication that your AC compressor is going bad and putting an extra strain on the motor while it is running. You can check the performance of your AC compressor using a set of mechanics gauges to check the pressure rise across your compressor.

      -BDP

  115. Hey , I have a 2000 chevy impala, A/C only blows hot air. I’ve checked the freon pressure it’s good, condesor responds fine it seems. I check the pipes from low valve they aren’t really cold or hot. Any ideas to check before seeing a service mechanic?

    1. Matt-

      Being that your freon seems to be at the proper level, you may want to check the condenser for any blockage, ie. leaves, rocks, dirt, etc. Clearing this debris should return your air conditioning back to normal operation. If the condenser looks free flowing, you can also inspect the cooling fans to see if they are broken or clogged with any debris.

      Thank you!

      -BDP

  116. Hello I have a 1992 Ford Crown Victoria that was giving to me by my grandparents about 3 years ago. I never had to use the AC until this year but when I attempted to turn it on all it did was blow out hot air. Before the car was giving to me it sat in the garage for months on end since they used my grandfathers truck which is why the car only has 108,000 original miles on it. My question to you is, why is it blowing hot air and not cold? I haven’t really had time to check everything yet since I work 6 days a week. What can I all check to see what the problem is? Any help would be great. Thank you in advance.

  117. I have a 1999 Taurus. My AC has always worked fine. Last month my AC stopped blowing cold air while I was on the freeway. I left it still running because air movement was better than nothing on a hot day. Well 15 minutes later my entire car filled up with white smoke or vapor coming from the vents. My car still runs fine I just haven’t tried to turn on the air since then. What could have caused this?

  118. Thanks for taking the time to write this article. I have been googling for hours and days, and haven’t been able to find an answer to my problem. All the typical issues have been weighed out of the equation. Maybe I’m not asking the right question in the right way… or maybe the info just simply does not exist on the net. Maybe you can help me out?

    I have a 98 Buick Lesabre (Limited Edition)

    They A/C has not worked since the beginning of summer last year. Someone put more refrigerant in it, but it did nothing to help. Air blows through the vent, but it’s not getting cold.

    So far, I’ve:
    *Checked the relay for continuity (had continuity)
    *Checked the pressure to see if it might be leaking (it was actually overfilled, so I released some pressure)
    *Checked the condenser fan (it’s working)
    *Checked the clutch/compressor (it comes on fine)
    *Checked the condenser for clogs (there was very little)
    *Check for cabin filter (could not find one, other than the plastic grid/screen that would hypothetically be covering it)
    *And like I said before, refrigerant has been added to the system since last year

    The thing I’ve noticed is that the accumulator is not getting cold at all. There was condensation on the accumulator and it was getting cold when the air conditioner started not working last year. But none at all now.

    Also, I’m not sure if this applies, but the other issue I’ve had with the ventilation system is that the air only blows at the window vent. It won’t blow anywhere else.

    I’ve also had an issue in the winter where my heat would only work intermittently. It would sometimes blow hot, and other times cold.

    Therefore the only conclusion I can come to is that the accumulator may be bad, or something with the electrical wiring or the electrical control panel.. or both. I’m not sure. This is where you would come in, if you would be so kind to help me out.

    What would you suggest in my situation?

    1. Angela,

      Thanks for taking the time to explain to us what’s going on with your car! Our guess is that you have two things going on. First, with your air conditioning it sounds like you’ve got a clog in your accumulator. The accumulator actually collects moisture and extra oil in your system to keep it working properly. Sometimes when adding refrigerant you can also add contamination and too much oil for the system which will clog your accumulator and keep your system from cooling properly. Based on everything else you’ve checked, this seems like one of the last possibilities.

      The second thing that seems odd is your air only blowing from certain vents and the heat working intermittently. It sounds like your HVAC and vent controls are kind of going haywire. If it were just one issue, we would say it’s possible it is simply a servo at one of the flapper doors in the system but since you’re having multiple problems with yours, it sounds like the actual control unit may be bad. If you have the patience you can probably test all the outputs from the units to see if they’re correct or you could try getting a spare from another car and installing it to see if some or all of the intermittent problems go away. It is possible that a bad control unit is also causing your AC to not work but if that were the case, the AC lines should still get cold even if you don’t get cool air from your vents.

  119. So I have an 03 Subaru Impreza wrx I just had a shop install a new compressor, and hose running from the compressor it worked for 2 days and then it started blowing hot air I took it back to the shop there’s no leaks and the freon is full he accidentally touched one of the ac hoses and it was extremely hot… Any solutions?

    1. Johnathan,

      It sounds like you have a clog somewhere in your system. The expansion valve is the device that actually creates the cooling effect in the refrigerant so if that was clogged or malfunctioning it would make sense that the compressor was continuing to add heat to the system without it being removed causing the line to be hot. The other possibility is that your condenser is not properly cooling the hot compressed refrigerant either due to an internal or external clog or you cooling fans not functioning. The fans should come on anytime your compressor is running. If they aren’t coming on immediately try checking the fuse and relays.

  120. I have a Honda Civic 2008. The AC cools well when its not hot outside , but whenever it gets hot outside the cooling stops after car has run 15-20 kms. AC technician has replaced coil , filled up AC Gas , serviced the AC , He says AC clutch is also fine. On his recommendation i also changed the car coolant , spark plugs , However the problem persists.

    1. Tanuj,

      Thanks for your question about Civic’s air conditioning. Your mechanic may be correct in that a tune-up will help your AC system start working properly again. Your car has safety features that will turn the AC off if your car starts to overheat or encounters any other problems to keep from adding load to your engine so those maintenance items may help. The other possibility is that your system is overfilled with refrigerant. That would cause your system to reach the high pressure cut off on hot days after a few km of driving shutting the compressor off to keep the system from damaging itself. It may be worth having your mechanic recheck the refrigerant levels in your system to ensure they are correct.

    1. Nate-

      Thanks for your question about your Explorer. Usually when you get different temperature air from different areas of your vehicle the problem is with your dual climate control system. If your car is equipped with dual climate control it may be the module, or the blend door for the rear. Most likely one of the 2 will be the culprit and the problem can be fixed by addressing them.

      Thanks!

      -BDP

  121. 2001 VW GTI 2.8 12v VR6 blowing hot air.. there was a knocking noise every time i turned my AC on for a few days.. then it quit and the AC broke. ive had the compressor changed out about 4 yrs ago and the pulley and condenser seem to be engaging when i turn on the AC. i noticed today that my driver side cooling fan isnt working, but the passenger side is. think this may be my problem..any ideas? should i put 12 volts to it and check to see if it turns on, and can this cause the sys to blow hot air

    Thank you for the info…

    1. Jeff,

      Thanks for your question about your VW GTI. The fact that one fan isn’t turning on may be a problem, or it may be that your car only runs one fan while the AC is on and the other when your engine coolant gets too warm. When you hear noise coming from your air conditioning system it is almost always an indication that your AC compressor is going bad. To check this you can measure the system pressure before and after the compressor to see if you get the proper pressure rise. If the low side pressure is good but the high side pressure is too low, you will need to replace your compressor.

      Thanks again for your question!
      -BD Auto Pro

  122. Hey guys..thanks for the awesome post

    I own a 2010 Lexus..few days back..the ac was throwing cold air whn in low speed and whn i accelerate the cooling goes off and it starts throwing hot air..i thght the gas was low..and indeed it was low whn i got it checked up..they fill the gas and thn it started working fine..this is was 2 days back..and now it is not cooling at all..it is throwing hot air and i sweat like a pig (its a black car and i stay in Gulf)..i got it checked up and they said simply change the compressor/evaporator without doing enough testing..i thinnk thats not the appropriate solution. .would appreciate your views on this..

    1. Bhavik,

      Thanks for your question about your Lexus. At first guess, it sounds like you just have a leak in your system so the new refrigerant you put in simply leaked out causing your system to malfunction again. If this is the case the low side pressure should be low or zero now. You would only change the compressor if the pressure rise from the low side to the high side isn’t large enough and you would only change the evaporator if it was clogged or had a leak.

      If you do simply have a leak, you can use BlueDevil Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak. Then next time you add refrigerant it won’t leak out and your system should stay working properly.

      Thanks again for your question!
      -BD Auto Pro

  123. I have a 2000 Honda accord lx. In the past year I have had an issue with my AC. During the winter months the heat would blow cool to cold air with the heat working periodically. So I had it serviced. It only worked for a time and my mechanic did suggest taking apart the dashboard to make sure the wiring was faulty. This summer the cold air worked periodically and recently only blows hot air. I’ve added antifreeze and stop leak to the radiator but it doesn’t seem me help. I’m really at a loss with what else to do.

    1. Ashton,

      Thanks for your question about your Honda Accord. The problem you’re having does sound more like a problem with your ventilation system than either your heat or AC. The fact that they both work intermittently sounds like a problem with the blend door. The blend door controls whether the air in your ventilation system blows over the heater core to be heated, or your AC coils to be cooled. If it’s got a mind of its own it is probably due to an electrical short in the control motor for that door. Your mechanic is correct that taking apart the dash to find the faulty wiring or control motor is probably the best place to start.

      Thanks again for your question!
      -BD Auto Pro

  124. Hi I have a concern. Why is my a/c blowing hot air randomly when the a/c is in use? And also if I step on it, it starts to blow air for a couple of seconds and then gets cool again

    1. Phillip,

      Thanks for your question about the air conditioning in your car. The symptoms you are having are a little tough to diagnose. Start by having the pressures measured in your AC system to help you figure out if your compressor is working properly, your system is flowing properly and you have enough refrigerant. If that all checks out fine you might look into your actual ventilation controls being the problem and not properly directing air over your cooling coils.

      Thanks again for your question!
      -BD Auto Pro

  125. I have a 2012 Chevy Impala that the a/c no longer blows cold air. A few days ago after turning the defrost off and the a/c on I hear a clicking noise. Now my a/c will no longer blow cold air. Living in Florida, a/c is almost a must have this time of year. Do you have any idea of what could be wrong? I’m melting!!!!

    1. Christy,

      Thanks for your question about your Impala. The clicking noise you heard sounds like one of the flaps in your ventilation system malfunctioning. There are a series of doors and flaps controlled by servo motors in your ventilation system that direct the air where to go, including the blend door which directs the air of your cooling coils or heater core. It sounds like that door may be broken so the air isn’t getting sent over the cooling coils leaving you hot. Replacing or repairing these components can be difficult as they are behind your dashboard so you may be in for a trip to the mechanic.

      Thanks again for your question!
      -BD Auto Pro

  126. My 2008 Altima air conditioner stops blowing air intermittently but not often. there are times the air does not blow, but it is cold. Sometimes if I turn the fan to high it will kick in and if I don’t drop the fan speed lower I will get the air. usually after a day or 2 of doing this the air will work up to a month and begin the process over again. It is difficult to diagnosis it because it always works for the mechanics.

    1. Debbie,

      Thanks for your question about your 2008 Altima. The problem you’re having sounds like an electrical problem. Most of the time when things work intermittently like that it’s due to a loose wire or connection. In your case, it sounds like the blow motor resistor may be bad or have a loose connection. The resistor is a relatively inexpensive part to replace so it may be worth just replacing that to see if it keeps your problem away. The other possibility would be a loose wire on the fan switch or the actual blower motor, but both of those are difficult to get to. For more information on diagnosing electrical problems, check out our article about that here: https://www.gobdp.com/blog/diagnosing-electrical-problems/.

      Thanks again for your question!
      -BD Auto Pro

  127. My AC has been starting to blow warmer air while on. A few days ago the air coming out was very warm – like the heat was on. I went and bought a freon recharge cannister. The AC was turned on all the way during the recharge and now the driver side vents still blow warm air and the passenger and all rear vents (i have an suv) all blow cold air. What’s up with that?

    1. Becky-

      Thanks for your question about your Yukon. Usually when you get different temperature air from different sides of your car the problem is with your dual climate control system. If your car is equipped with dual climate control it may be the module, or the blend door for the driver’s side. Most likely one of the 2 will be the culprit and the problem can be fixed by addressing them.

      Thanks!

      -BDP

  128. I drive a 2004 Honda Accord and sometimes it blows hot air only on the driver side while the passenger side vents blow cool air. Any ideas why this might be happening???

    1. Adam-

      Thank you for your question about your 2004 Honda Accord. It sounds like the blend door on the drivers side is stuck or not functioning properly. We recommend taking it to a local A/C shop to be addressed.

      Thank you!

      -BDP

  129. i have a 2008 corolla axio,when my car is at stand still the ac works fine but when i start to drive it starts to blow warm then cold on and off. when i stop it starts back to get cold

    1. Marrk,

      Thanks for your question about your Corolla. It sounds like your AC system may be over filled with refrigerant, or you have a clog in the system. When you’re driving your compressor is spinning faster and can increase the pressure more quickly. If your system is overfilled it will hit the high pressure cut off and stop your compressor causing it to blow warm. Similarly, if there is a clog, the pressure would get too high while driving and cause it to intermittently blow hot.

      To check for the proper amount of refrigerant and for a clog you should have the pressures measured around your system to diagnose what the problem is and which component is causing it.

      Thanks again for your question!
      -BD Auto Pro

  130. My fiancé drives a 2008 Mazda CX9 2WD and the other day she pulled into a store and said that when she parked there was a hissing noise and smoke coming from under the hood but there wasn’t any fluid on the ground under the car as would happen if it was antifreeze leaking and the car was not over heating either. After a little while at the store the smoke and hissing noise went away but now the AC only blows hot air. The compressor doesn’t seem to be turning on either. Do you think that we have a bad compressor or did one of the Freon lines just burst and that is what’s causing the compressor to not turn on? Please help.
    Thank You,
    Damon

    1. Damon,

      Thanks for your question. It sounds like you do have a leak in your AC system somewhere. The refrigerant in your air conditioning system is a gas at room temperature which is why you didn’t see any puddles from the leak. If you have a leak, the low pressure in the system would keep the compressor from turning on the protect it. We would recommend using BlueDevil Red Angle AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal your leak, then recharge your system to the proper pressure with refrigerant to get your AC working again.

      Thanks again for your question!
      -BD Auto Pro

  131. I have a 2014 Ford Focus. Air conditioner working fine then all of a sudden white smoke poured out from under passenger front wheel and smelled like rubber. The air started blowing hot air. I thought maybe the surpentine belt but the belt looked good. Could I have had a fire in the electrical system of the air compressor?

    1. Duane,

      Thanks for your question about your Ford Focus. Since your car is so new, you may consider taking it back to a Ford dealership as your problem may be able to be repaired under warranty. It seems most likely your AC compressor seized. If you simply had an electrical short it would have been a small puff of smoke. Your description does like the compressor has an internal failure of some sort.

      Thanks again for your question!
      -BD Auto Pro

  132. Ok so my a.c. has worked fine since I got my 2008 scion XB im driving down the highway and suddenly I feel and hear what seemed like a blowout of some kind it wasn’t loud nor did really feel it but my first thought was did I my front right side tire just go, it did not but then realized my a.c. maxed out is now blowing no cold air, its not hot but not cool either. And I hear what sounds like a clicking so I get home park and pop the hood, now that im parked its blowing hot air and I hear the click. When I rev the motor the clicking gets faster, a.c. off no click. What could this be and what would have made the blowout sound?

    1. David,

      Thanks for your question about your 2008 Scion. Based on your description is sounds like you’ve had a pretty catastrophic failure in your AC compressor. If your compressor had an internal failure it would have allowed the high pressure refrigerant to blow back into the low pressure side of your system which would have caused internal damage and may be causing the clicking noise you’re hearing. If the noise you heard was an external blowout, you would have noticed AC oil spots all around the area where the blowout occurred. If you don’t see any oil spots, we would recommend replacing your compressor and going from there.

      Thanks again for your question!
      -BD Auto Pro

  133. I have a 2011 honda ridgeline. I was idling in a parking lot for 5 mim and my ac was blowing cold air then it instantly started blowing hot air. your thoughts?

    1. Tim,

      Thanks for your question about your Honda Ridgeline. If your air conditioning started blowing cold after you started driving again it could be that your system hit the high pressure cut off due to a lack of cooling. This could be due to an externally clogged condenser or because your cooling fans are not functioning properly. Try checking your condenser for leaves or debris and make sure all your cooling fans are running when your car is idling with the AC on.

      Thanks again for your question!
      -BD Auto Pro

  134. I have read through most of the posts and didn’t seem to find an answer to my problem. I have a 2002 Chevy S-10. The refrigerant is heating up causing the compressor to kick off. After a while it turns back on. I had the system check and they replaced the clutch fan which helped some. What else would cause the refrigerant to heat up ( or not get cooled off properly)?

    1. Andrew,

      Thanks for your question about your S-10. It could be that your Condensor just isn’t working efficiently any more either to external clogging from dirt and debris or from bent fins. It also could be that you have an internal clog in your system somewhere and that is making the compressor work too hard to raise the pressure in the system which would cause the refrigerant to heat up more than it should. Try having the high pressure side tested in your system and check your condenser for external clogs.

      Thanks again for your question!
      -BD Auto Pro

  135. Hello,
    I appreciate any help you could give on my AC issue. I have a 2009 Nissan Murano. Last weekend while driving my AC stopped blowing cold. I didn’t notice a decline in how the system was cooling, it just stopped. First thing I did was check my fuse box, but could not locate a blown fuse for the AC. I tried to see if there was a Relay that had an AC label but did not see one. I’m sure there is a relay but hard to tell which one.
    I spoke to a guy I work with who suggested checking the low pressure switch. I located it to the right of my condenser behind the grill. I tried to jump it in different variations but could not get my AC clutch to kick in.
    Also, after this issue started happening I noticed a new knocking sound that will speed up as I accelerate. I can’t pin point it to the compressor exactly because it’s so cramped down at the bottom, but makes since it could be the compressor since the sounds started after the cold air stopped.
    I have an AC refrigerant charger with a gauge that only goes on the low side, but without the clutch kicking in I’m unable to read correctly. It just shows the pressure in the 100’s.
    Last thing I noticed was yesterday with it cooler outside, I ran the blower with the windows up to let air in and noticed an electrical burning smell. I shut off the blower after that and just kept riding with the windows down.
    I’m thinking it’s the compressor but I’m hoping I’m missing something easy.
    Thanks for the help.
    Paul

    1. Paul,

      Thanks for your question about the air conditioning in your Murano. For starters, try reading our article about electrical problems here: https://www.gobdp.com/blog/diagnosing-electrical-problems/. If you can find a wiring diagram for your car and use the procedures mentioned in that article you may be able to pinpoint what your problem is. Based on the noise you heard and the smell, our best guess would be there is an electrical short in your compressor.

      Thanks again for your question!
      -BD Auto Pro

  136. Hi,
    I have a 2006 chrysler srt8 and recently refilled the AC but i still get hot air. I refilled it in the bottom nozzle and got some pressure back. the problem is that before i refilled the AC was cold but not cold enough so now that i refilled it the cold air is gone and it only blows hot air. Any suggestions what the problem might be.

    1. Joe,

      Thanks for your question about your Chrysler. It sounds like you may have a clog in your system, or it may be overfilled with refrigerant. Either a clog or too much refrigerant will cause the system to reach its high pressure cutoff which will shut down the compressor and cause warm air to blow. We would recommend having your system evacuated and refilled with the proper amount of refrigerant and then have the system’s pressures tested to see if you have a clogged component.

      Thanks again for your question!
      -BD Auto Pro

  137. Hi,

    I am using Nissan Tiida – 2009 model car. Six months back, i changed my oil & filter in my car and within few days time, A/C given me a problem of not giving cool air. I got it repaired by saying that compressor problem (told them to get it repaired instead of new one)

    Now few days back i changed oil & filter for my car and now again A/C is giving same problem of not giving cool air.

    Why it is happening only at the time of oil change? What is the permanent solution for this? Please suggest

    If it is to be replaced how much it will cost me… Please guide

    1. Ravi,

      Thanks for your question about your Nissan Tiida. It seems extremely unlikely that your air conditioning would stop working due to an oil change, so our guess so far is that it is just a coincidence and you should fix your air conditioning using the procedure in this article. The only thing we would recommend checking for is if there are any air conditioning lines near your oil filter or oil drain plug. If the lines are close they could be getting damaged during the oil changed. If that is the case, we would recommend replacing those lines to ensure you don’t have a leak.

      Thanks again for your question!
      -BD Auto Pro

  138. Hello Bluedevil, I changed my 2009 toyota corolla compressor to a new denso OEM 6 months ago. The compressor has been working well. However i recently noticed oil under the hood a week ago. I washed and cleaned the area and did not see oil for a week until this morning when i popped the hood. I cleaned again with soap and water, and also cleaned the surface of the pressure releive valve with a tissue ,then i started the system.the system run for 15 minutes , and i checked again. No oil was found on the plastic parts under the compressor, however a drop of oil had appeared on the pressure releive valve when i touched it.
    Is it normal for fresh oil to be on the pressure relieve valve? Can the valve be replaced. Thanks

    1. Gabriel,

      Thanks for your question about your Corolla. It is possible that your AC system relief valve is malfunctioning. Most Air conditioning systems that do have relief valves have it integral to the compressor so it would be new with your new compressor. We would recommend having your system pressures checked by a mechanic as it seems more likely that you have a clog somewhere in your system causing the high pressure.

      Thanks again for your question!
      -BD Auto Pro

  139. Hi there, I have a Subaru forester 2002 model non turbo and have had no issues with my ac cooling system as well as choosing air flow from outside of the car through my vents with the ac off…Yesterday it’s decided it wants to stop working and pretty much no air coming out of vents at all until I play and fiddle around with the knobs on the air and ac…I’ve checked the fuse and also can hear the compressor wanting to work and everything under the bonnet ac wise is freezing cold pipe wise etc…Any ideas? Air seems it wants to come out at allocated feet position more rather then all of the other settings…ideas please : ) ?

    1. Adam,

      Thanks for your question about your Subaru Forester. It does sound like your AC is working great, but your HVAC system isn’t working properly. There are a series of doors and servo motors that control where the air comes out of the best and if it is hot or cold. It sounds like you’ve got a short somewhere in your system that isn’t allowing those motors to correctly control the air flow in your car. It could be a simple short somewhere, a broken control motor or it could be an indication that your HVAC control unit is damaged. Unfortunately, figuring out which is the case will take quite a bit of troubleshooting and disassembly of the interior of your car and may be best left to a Subaru mechanic.

      Thanks again for your question!
      -BD Auto Pro

  140. Hi,

    I have a 2008 Suzuki SX4 and had been having this problem for quite some time but can’t seems to find the fault hope you can shed some light on it.

    Everyday when i drive after the first 20 mins on the highway speed above 60Mph my ac will stop blowing cold air but once i exited the highway and decelerate to about 40mph and below my ac start blowing very cold air.

    I can drive for hours on normal road with speed not exceeding 40-50mph but once on the highway and i pick up my speed to above 60mph my ac will cut off.

    when on idle my ac is cold too, that makes it hard for the workshop to replicate the fault.

    since my ac is blowing cold air when on idle i don’t think its a low freon issue right?

    please help

    thanks

    1. Kelvin,

      Thanks for your question about your 2008 SX4. The only possibility we can think of is that when you’re on the highway, the constant high RPMs cause your system to overpressurize and reach an overpressure trip which shuts things down. Once you slow down, the pressure gets low enough that things can start to operate properly. This could be caused by a faulty compressor clutch or a clog on the high pressure side of your system.

      Thanks again for your question!
      -BD Auto Pro

  141. I Have a 1995 GMC Suburban 4×4. My A/C blows nothing but hot air even when I have the air control turned off. I almost gets to an uncomfortable hot or even burning sometimes. With the summer coming up quick I want to try and get it fixed ASAP. Do you have any ideas of what it could be.

    1. Jordan,

      With your A/c blowing that hot all the time, it sounds like your problem may actually be with your ventilation system, not your air conditioning. There is a door in your vents that controls whether the ventilation air blows over the heater or the air conditioning coils and it sounds like yours is stuck on the “heat” setting. This door should be just after the blower motor which will be behind the dashboard on the passenger side. If you can get to it you should be able to see where the disconnect is from your controls to the door.

      Thanks again for your question!
      -BD Auto Pro

  142. read all comments and your reply’s. Sounds like you can help us figure out what our problem is. Start and drive car (Nissan Sentra 2.0) for 2-3 minutes before turning a/c on. Air coming out is warm. Takes 10 to 15 minutes before cold air slowly starts to come out but not as cold as it used to be. When we stop, turn off a/c, leave the car and then get back in car and start going again, the a/c air is the same, warm and then gradually colder but never as cold as it used to be. My wife and I live on a fixed income and could surely use your help in determining what what we can do to correct this before summer gets here!! Thanks for your help, Alan & Donna

    1. Donna,

      Thanks for your question about your air conditioning. The problem may be with your electric fans as some other people have had. If the fans aren’t functioning it would take the motion of the car to cool the AC condenser and how cold the AC is would depending on your vehicle’s speed (the faster you go, the colder it would get). If that doesn’t seem like the problem, then it sounds most like you’ve got a clog in your system somewhere. A clog would make your compressor work extra hard to move the refrigerant through your system which would diminish the cooling capacity of the system and cause it to be slow to start.

      Unfortunately, you can only find where a clog is in your system using a set of mechanic’s AC gauges so you may be in for a trip to a mechanic unless you have the correct tools.

      Thanks again for your question!
      -BD Auto Pro

  143. Hello, great article and information.
    I have a 2001 Toyota Highlander. The AC works great most of the time, but about once or twice a week without any notice, it will start blowing hot air. If I turn the heat knobs back and forth, and turn AC on and off a couple times it starts working again. Any ideas what may be the problem? The dealership couldn’t find any issue, but they never experienced the heat issue.

    1. Patrick,

      Thanks for your question about your Highlander. As you experienced at the dealership, intermittent problems like this can be the most difficult to diagnose. Since your AC works properly most of the time, our guess would be the problem is actually with the HVAC system in your car rather than the air conditioning. There is a small door that directs air from your fan either over the heater or the AC coils. This door is operated by your ventilation controls and moved by a small servo. It sound like either the computer controls or the servo have a short somewhere that causes this door to reposition without your input which is why it goes back to normal if you fiddle with the controls. Without being able to duplicate the problem consistently it will be difficult to determine which is the cause.

      Thanks again for your question!
      -BD Auto Pro

  144. I have a 20005 Ford Freestyle. The AC works fine aslong as your driving but when I stop it blows warm air. What could be the problem and is this something costly or an easy and inexpensive fix?

  145. Hello,my ac giving me a frustrated my ac sometimes working sometimes not,while im driving its okay but when i still driving becomes hot,i have to race my engin to get the ac cold again but sometimes also i race it didnt come out why is this happening my gas compressor is full my belt been fix the magnet also okay…

    1. Malikul,

      Thanks for your question about your air conditioning. The problem could be that your AC fans are not coming on which would cause your AC to blow hot when your vehicle isn’t moving or your engine is at low RPMs. You can check this by popping your hood and watching to see if the fans come on when you turn the AC on. The other problem could be that your compressor is failing or there is a clog in your system. If either of these is the case it would take high engine RPM to keep your air conditioning working problem. Unfortunately to check and see if this is the case you would need to have a set of mechanic’s AC gauges or take your car to a shop.

      Thanks again for your question!
      -BD Auto Pro

  146. I hava a 05 ford freestyle all brand new ac system worked perfect yesterday but now its seems like its stuck on heat checked feron its fine

    1. Larry-

      Thank you for your question about your ’05 Ford Freestyle. We recommend first checking the pressures around your system to see if there is a clog and to make sure your compressor is working properly. If your low side pressure is too high your system may be over filled. If you high side pressure is too low, your compressor may be in need of replacement. If your high side pressure is too high then you may have a clog in your system, usually in the condenser or dryer.

      If the pressure around your system are in the acceptable range then your problem maybe that your air blend door inside your HVAC system is broken and stuck on the “hot” setting. If this is the case, your AC system could be working properly but your ventilation system may be reheating the air after it is cooled.

      Thank you!

      -BDP

  147. Hi, I have a 2003 VW Polo and whilst the air con is cold most of the time sometimes it will blow hot for no reason, usually while I’m driving. Any ideas what the problem might be?

  148. 2010 Chevy Equinox.

    Bought a refill with gauge to put new freon in. Now a month later and pretty decent usage of the A/C it is blowing hot air again. I will be placing some stop leak in it.

    However for months now I have had squealing coming from the A/C system only when it kicks on. It happens at different times and doesn’t last long.

    I checked all belts and they were in good condition but I am thinking it could be a pulley issue. Problem is, with the design of the equinox in order to get to the pulley system you have to unmount and Jack up the engine.

    Any suggestions?

    1. DJ,

      Thanks for your question about your Chevy Equinox. If you’re finding a low refrigerant level regularly we would recommend adding Red Angel AC Stop Leak to seal your leak and get things back to normal. The squealing noise you’re hearing indicates your AC compressor pulley is slipping on the belt when the compressor engages. This could indicate that you need to add some oil to lubricate your system, or that your AC compressor is starting to wear out, or that you need to change the belt. The design of your Equinox does make it difficult to change the belt, but yous should be able to inspect it for cracks or glazing at a more accessible point to determine if it needs to be changed.

      Thanks again for your question!
      -BD Auto Pro

  149. I have a 2003 Honda Accord. I was riding down the interstate one day and noticed smoke coming from the hood(gray/white smoke). I begin to pull over but the smoke stopped and my car wasn’t running hot so I decided to push it to my destination and check it out on my arrival. (I was in ATL traffic). about 3 miles into the ride I noticed it was growing extremely hot inside my car ( I was driving with the windows up) I checked the AC it was blowing hot so I let the windows down.

    Once I got home I checked under the hood but there was not leakage or breakage. I drove my Honda the next day and the air didn’t work again.

    I am lost as to what the problem could be. Could you assist me?

    1. D,

      Thanks for your question about your 2003 Honda Accord. The smoke you saw coming from under your hood was most likely an indication of a coolant leak as the other common leak is an oil leak and it would produce black smoke and distinct burnt smell. Our recommendation would be to check your coolant level and make sure your cooling system stays topped off.

      The only way we can see the smoke you saw being related to your air conditioning not working is if the smoke you saw was actually a very large leak in your air conditioning system and it was escaping refrigerant. Usually the refrigerant in your car is clear and doesn’t look like smoke but in the right conditions you may have been able to see it. If this is the case, it wouldn’t leave any sign of a leak, but your AC would stop working. Try checking the pressures in your air conditioning system. If you had a leak that big you would have zero pressure in your system.

      Thanks again for your question!
      -BD Auto Pro

  150. Hi!
    I have a 2003 Hyundai Elantra. A couple weeks ago, my sister noticed that my temperature gauge would move above the half-way mark then go back down. She then took it to a mechanic and had some coolant added and it seemed to resolve. However, maybe a week later, it started moving again and my sister took it back to have more added but the mechanic said it was full of coolant and that it could be the radiator or an electrical issue because the engine was not hot. Some days later the A/C began to go out. It would be cold for 5 minutes and then blow out hot. What could be the problem?

    1. Amber,

      Thanks for your question about your 2004 Hyundai. We would agree with your mechanic that you probably do have an electrical problem that is allowing your car to get hot and causing your air conditioning to not work. Your car has one or 2 electric fans that keep the engine and your AC condenser cool. If those fans are malfunctioning it would cause the overheating issue you’re having as well as your AC to stop blowing cold. We would recommend checking these fans for proper operation and checking the fuses and relays as well.

      Thanks again for your question!
      -BD Auto Pro

  151. compressor is working intermittently.
    replaced with new compressor – no go
    removed,vacumed,put new freon
    replaced compressor sensor or thermostat
    cleaned the system
    new cooling rod
    checked relay , fuses, capillaries
    checked radiater and AC fan
    still the problem persist

    1. Roy,

      Thanks for your question about your AC compressor. On almost all vehicles your AC compressor will cycle on and off depending on the cooling load on the system. On cooler days your compressor will spend more time off and on warmer days when it takes more to cool the cabin of your vehicle the compressor will stay on for longer. As long as your getting the proper temperature air from your vents, it’s ok for your compressor to cycle on and off.

      Thanks again for your question!
      -BD Auto Pro

  152. I have a 2003 Toyota Corolla and when I turn on the AC it works for about 5 minutes then starts blowing hot air. Please advise.

    1. Rpertel,

      Thanks for your question about your Corolla. It is possible that your AC system is reaching the high pressure cut off after about 5 minutes of operation due to a clog somewhere in your system. You should consider having the high pressure side pressure checked around your system to see if you can identify a clog in one of the components. You may also consider checking your electric fans for proper operation. One or both of them should come on when you turn your air conditioning on. If neither do, then your system would quickly get heat soaked causing it to stop blowing cold air.

      Thanks again for your question!
      -BD Auto Pro

  153. hi..
    i own a toyota wish 2006 model. When the car is on move the air cond blows fine..but when the car in idle position (ex: at the traffic light) its started to blow warm air. I notice that when the fan blows in high speed, the air cond is cold although the car is in idle position, when the fan is on low speed it will blow the warm air. And another thing is that the time period of the fan to change speed from low to high takes about 8 to 10 minutes which make you feel uncomfortable inside the car waiting for the cold air.. I think this is concerning about the fan..hope u can assist me. (I thought of changing only one speed fan (high speed) )
    tq sir

    1. Art,

      Thanks for your question about your Toyota Wish. Usually, when air conditioning works while you’re driving but not while you’re stopped it is because the electric cooling fans aren’t coming on to cool the condenser while you’re stopped. That could be due to a bad relay, bad fuse or a failed fan.

      Your description of the fan taking a long time to reach full speed sounds very odd. You might consider changing the fan resistor or checking your cabin air filter to make sure it isn’t interfering with the fan operation.

      Thanks again for your question!
      -BD Auto Pro

  154. Hello. I have a 2007 Chevrolet Silverado 1500 crew cab. For about a year now the AC has not worked but on a rare occasion it does come on for no apparent reason and if I shut the truck off it will only blow hot air again. If it was a leak, and since it has been a year, I would assume that there would be no coolant left after a year, but yet like I said on rare occassions it does come on until I turn the truck off. Any idea what might be wrong?

    1. Greg,

      Thanks for your question about your 2007 Silverado. We agree that if you had a leak in your system, by now it would have stopped working intermittently. intermittent problems like you’re describing usually are due to electrical issues so we would recommend checking the pressure sensors in your system. If one has failed it could be keeping your system from operating as it thinks there is an overpressure conditioning.

      Thanks again for your question!
      -BD Auto Pro

  155. My mother in law’s 2000 Chevrolet Cavalier blows hot air, I purchased a refill can of Freon and hooked it up to the low pressure port, turned on the engine and the a/c and it seems the Freon is not going into the line. I tried it on my car and it flows great. What could be the problem. Thanks for your time

    1. Randy,

      Thanks for your question about your 2000 Chevy Cavalier. In order for the refrigerant to transfer into your system, the compressor would need to be cycling otherwise the low side pressure will be too high to allow the refrigerant to flow out of the can. When you turn on the AC, check the center section of the compressor to see if it is engaging and cycling. If it is, refrigerant may still be flowing into the system if the refill can is getting cold even if you can’t hear or feel it.

      If your AC compressor is not cycling then your problem is most likely not a low refrigerant level,but a bad compressor, compressor clutch or an electrical fault.

      Thanks again for your question!
      -BD Auto Pro

  156. I have a 2014 Jeep patriot Latitude. The seal to my sun roof was broken for about a month before I got around to replacing it. In that time it had been raining like crazy in my city. Now the a/c is not blowing cold air. everyone keeps telling me it the compressor, but I can’t afford to pay that. So im hoping it may be something else. I took the jeep to auto zone to check the computer, fuses, and relays and they were all good. Any advice?

    1. Vanessa,

      Thanks for your question about your Jeep patriot. First, we would recommend calling your local Jeep dealership and seeing if the air conditioning system in your vehicle is still covered under a factory warranty since it is still so new. We can’t think of a way that your leaking sunroof would be related to your AC not working so it seems like those problems are unrelated. You can prove your AC compressor is bad by hooking your vehicle up to a set of mechanic’s AC gauges and checking the pressure increase across your compressor. If it is lower than it should be, then you would need a new compressor. You could also simply have a clog in the system or a low refrigerant level which those gauges could tell you as well.

      Thanks again for your question!
      -BD Auto Pro

  157. I have a 2010 Acura TL with Technology package. The AC went out, the problem was it was intermittently old. It was diagnosed as needing the clutch and coil replaced which I had done. Nine days later the AC went out again. What could be the possible issue?

    1. AJ,

      Thanks for your question about your Acura TL. To start you could try taking your car back to the mechanic who replaced the clutch and coil and see if he will check his work and rediagnose the problem for free. intermittent problems like you’re having are often due to electrical issues so it could also be a pressure switch in your system malfunction or even the condenser fans or relays. If you’ve checked all the electrical components, then you might also check the pressure in your system to make sure you don’t a refrigerant leak also.

      Thanks again for your question!
      -BD Auto Pro

  158. I have a 2001 honda civic dx. My air has not worked since I had the car not that ik of bought in January so the air that blew felt cold. Now it’s June and my air blows hot. I added 2 cans of freon but still isn’t working. It will blow cool for like 2 seconds and it’s hot again.

    1. Christian,

      Thanks for your question about your 2001 Honda Civic. The AC system in your vehicle takes 23 ounces of refrigerant if it is empty so if you haven’t added that much refrigerant yet, you may still have to add more. If your system works for a short time with new refrigerant then it sounds like you’ve got a leak which is allowing all the refrigerant you add to escape. Try adding BlueDevil Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak, the adding the correct amount of refrigerant.

      Thanks again for your question!
      -BD Auto Pro

  159. My serpentine belt recently snapped on my 2010 Mercury Milan. When it did that it popped out the copper wiring on the side of my a/c compressor. Is there a way for me to replace that or would I have to purchase a whole new compressor.

    1. Belinda,

      Thanks for your question about your Mercury Milan! This is a difficult question to answer without seeing the wiring. Usually, the wires going to the compressor will have a plug or clip on the end to attach to the compressor. If that is the case you should be able to attach a new plug to the end of the broken wire and plug it back into the compressor. If there is no plug or clip on the end of the wire then you may need to purchase a new compressor to reestablish a connection.

      Thanks again for your question!
      -BD Auto Pro

  160. 2014 tacoma prerunner access cab – idleing in park position ac blows warm air
    while driving – ac works fine
    any idea what problem might be

    1. Mark,

      Thanks for your question about your Toyota Tacoma. Usually, when your AC doesn’t work unless your car is moving it is because the condenser isn’t being properly cooled at low speeds. This could be from a clogged or damaged condenser or because your AC cooling fans aren’t turning on. Try checking your condenser for damage or external blockage. You can also check the fuses and relays for your cooling fans and make sure they come on while your truck is idling and your turn the AC on.

      Thanks again for your question!
      -BD Auto Pro

  161. i have a 2010 Subaru forester. AC wasn’t blowing cold, so we added some refrigerant. after a short time we were back to blowing warm air. so this time we used a stop leak, which indicated to immediately add refrigerant, which i did. now the pressure on the low port is reading out of range for the outdoor air temperature and just on the line between green and red. in addition to that ive noticed that the compressor is cycling every few seconds. will overfilling cause the compressor to do this? i know in any case i need to discharge some of the refrigerant. any suggestions on how to do that??

    1. Chris,

      Thanks for your question about your Forester. The symptoms you’re describing do sound like you’ve got a slow leak in your system and it is possible that your system is overfilled. Your compressor does usually cycle when everything is normal but the cycles should be closer to a minute long depending on outside temperature. If you used a particulate leak stop agent you may have also clogged your system which would cause an abnormally high pressure and also cause frequent cycling in your system. The safest way to get your system back to having the correct amount of refrigerant is to have the system completely evacuated, then have it refilled with the correct weight of refrigerant.

      Thanks again for your question!
      -BD Auto Pro

  162. My 2002 Toyota Highlander runs cold for about 1/2 hour or so, then it starts to blow hot. I was curious, so I hit the a/c button to turn it off, waited a few minutes, then turned it back on. It acted like it was going to cool again, but blew hot again after about 15 – 30 seconds. Is this a freon issue or something else?

    1. Jeff,

      Thanks for your question about your Highlander. The problem you’re describing sounds more like you’re system is reaching the high pressure cutoff after it has been running for a long period of time. High pressure situations are caused either by overfilling your system with refrigerant or by having a clog somewhere in your system which is raising the pressure. To prove this is the case you would have to measure the high side pressure at different components in your system to determine if there is a clog or if your system is overfilled.

      Thanks again for your question!
      -BD Auto Pro

  163. Had a recall done on my 2010 H3 Hummer they replaced the connector module and harness on my HVAC system,
    It now only blows hot air. Could that be the problem or something. Had no problem with my AC before the recall.

    1. Pam,

      Thanks for your question about your Hummer. The hot air blowing could absolutely have to do with the recall you just had done. We would recommend taking your vehicle back to the dealership that did the work and having them check their work.

      Thanks again for your question!
      -BD Auto Pro

  164. Hello I have a 2004 Chrysler pacifica my AC is set on Cold how ever it blowing like a fan it feels like it wants to blow cold air for like 10sec then it goes back to blowing like a fan and the back vents are on high but not much air is blowing. Could it be my compressor

  165. I paid to have my air condition fix about a year ago,so it work for the summer but for winter time it would get cold.But when Itook my car in the heater worker so now it summer and the air condition is blowing hot heat,Can you please help me .I have a 2001 mercury marquis

  166. Hi, My Mazda Tribute 2003’s A/C cools sometimes when its running or idle while its on low, when running on high and driving it stops cooling, while whenever I turn the A/C on I can hear the fan make a very loud noise until I turn it off and it turns off as well. I went to get a inspection the mechanic told me the compressor had a leak and a new one is needed, I would like a second opinion on that please.

    1. Alexander,

      Thanks for your question about your Mazda Tribute. The problem you’re describing could be your AC compressor going bad. It could also be that your system is overfilled with refrigerant, but since you didn’t mention recently adding refrigerant, that may not be the problem. last, the problem you’re describing could also be caused by a clog in your system, most likely in the condenser or the expansion valve. A leak on its own would cause a low refrigerant level, but usually a low refrigerant level won’t cause the problems you’re describing.

      Thanks again for your question!
      -BD Auto Pro

  167. I have a 2004 Dodge Durango and They change my a/c compressor and it worked 2 days later the a/c warm again. Is cold while driving but when I parked, the a/c is hot. No leaked, new compressor and belt. What problem could it be? Do you think it might be need update.

    Thank You

    1. Ringo,

      Thanks for your question about your Dodge Durango. Most of the time if your AC works when your driving but doesn’t when you are stopped it is due to failed condenser fans. It could be that the fans have gone bad, or simply a blown fuse or reply. To check them, try popping your hood and turning on your AC. You should hear the electric fans come on right when you turn the AC on if they are working properly.

      Thanks again for your question!
      -BD Auto pro

  168. I went to a mechanic and was told my expansion valve needed to be replaced on my 2013 Nissan. Sentra I got the expansion valve had it replaced and then was called and told it wasn’t the expansion valve that it was the compressor so I went to a junk yard and bought a compressor had it changed and was told that compressor is bad too what can I do also was told that in the model of my vehicle all a.c.s are coming out messed up

    1. Ruby,

      Thanks for your question about your Nissan Sentra. First, we would recommend checking to see if any part of your air conditioning system is still covered under any factory warranty since your car is only a few years old. Also, you can try calling your local Nissan dealership and seeing if there are any recalls or technical service bulletins out for the air conditioning system in your car. If there are, the dealership may make repairs at little or no cost to you.

      If there aren’t any recalls or help available from the dealership, you can try filing a complaint with Nissan. If enough cars are affected with the same problem you’re having they may issue a recall or TSB.

      Thanks again for your question!
      -BD Auto Pro

  169. Hi,
    I have a 2010 Altima and it was blowing cold ac fine for a couple of years. It started blowing hot ac when I turned it on about 4-5 months ago and I had an ac recharge in addition to a leak detector (ink). No leak detected and the ac worked fine for the next 3-4 months. Now, it’s blowing only hot air again when I turn it on. I’m no expert, but I checked the compressor clutch and it turns fine (it actually appears to always turn??) Please advise. Thx!

    1. Chris,

      Thanks for your question about your Altima. If you’ve got the correct amount of refrigerant in your system and are still getting hot air it could indicate that your compressor has failed or that you’ve got a clog or failed expansion valve. You can check for both of these problems by measuring the high side pressure in your system. If it’s lower than normal, your compressor is probably in need of replacement. If it’s higher than normal, then you most likely have a clog somewhere in your system.

      Thanks again for your question!
      -BD Auto pro

  170. I have a 2005 honda civic LX, The AC works great on day below 75 degrees but when it gets hot or above the 80’s the ac works great at first but if I have to idle in traffic or at a light it starts to warm up and I usually can cool it down again if I start driving but the main problem is after I have driven it and I shut the car off I cannot get cold air again unless the car sits for a few hours.

    My mechanic has recharged and fixed the leak where the air dryer was and also replaced the pressure switch but I feel he may not be knowledgable to troubleshoot it further than that. Any ideas on any testing i can do at home or a direction I can point my mechanic to?

    1. Brandon,

      Thanks for your question about your Honda Civic. Based on your description it could be that you’ve got an AC fan going bad so it isn’t properly cooling your condenser on hot days or in traffic. You can check the fans for proper operation with your AC on at idle, but be careful as moving fans can be dangerous.

      The other most likely problem is a bad pressure or temperature switch in your system but those are difficult to diagnose and replace yourself. Most of the time the specifications for those sensors are something only dealerships will have access to.

      Thanks again for your question!
      -BD Auto Pro

  171. Hi, I have a wonderful SIENNA 2001 with 180,000 miles. Front AC works perfect all the time. Problem his with the rear unit. When I turn it on, 80% of the times it will blow HOT AIR and I know it is from the heater. Some times if you let it run for some 5 to 10 minutes it will change and start cooling (not always). Some other days, when I turn it on, it will cool normal. By the way, when it works right, it’s excellent. I pulled out the rear control panel (blower and temp) and everything looked good. WHAT CAN THE PROBLEM BE ???

    1. Ian,

      Thanks for your question about your Sienna. I think you’re on the right track with the rear control panel. Our guess would be either the module is going bad, or the control servo for the blend door has a short in it causing the air blend door swing to the “heat” position. Unfortunately, you can’t test the module without a special computer from a dealership but you may be able to test the control servo using a multimeter.

      Thanks again for your question!
      -BD Auto Pro

  172. Hello I have a 2003 Honda Element, AC was working fine, now if I am NOT driving fast it blows hot air when I drive faster is starts to work not as good but it is cold air, compressor is working, Freon is full, fans are working. TIA

    1. Terry,

      Thanks for your question about your Honda Element. Our best guess based on your description is that your compressor is starting to go bad and only power to create the proper pressures in your system at higher engine RPMS. Try checking the high side pressure in your system to see if the compressor is adequately making pressure at idle or low engine RPM.

      Thanks again for your question!
      -BD Auto Pro

  173. I have a 98 buick lesabre custom and i change my compressor and everything and vacuum the lines out put freon in and it still blows hot air. Maybe its the Condenser?

    1. AJ,

      Thanks for your question about your Buick Lesabre. We would recommend starting by checking the low and high side pressures in your system. That will help you determine if you’ve got enough refrigerant in your system and if you’ve got a clog downstream of the compressor. If the high side pressure is abnormally high you may have a clog. Those usually form in the expansion valve, the dryer or the condenser.

      Thanks again for your question!
      -BD Auto Pro

  174. I own a 2008 ford fusion. I have put new freon in, replaced relay switch and it still blows hot air. But, if I hot wire where the relay switch goes, it will blow cold air. What is the problem?

    1. Donna,

      It sounds like your relay isn’t getting the proper signal to close to turn your AC on. This could be a blown fuse, a loose wire, a bad AC button or a problem with the ventilation control module. We would recommend starting by checking the fuses. If those are good you can have a Ford dealership check the ventilation control module for proper operation. If the module is good, then you may have to start tracing the wires and connectors in between the module and the relay looking for a bad connection or broken wire.

      Thanks again for your question!
      -BD Auto Pro

  175. My 1996 Chrysler Concorde does not blow cold air unless the car is accelerating. And even then it does not blow very much at all. As soon as the car slows down it will stop completely. Any ideas?

    1. Christina,

      Thanks for your question about your Chrysler Concorde. Based on your description it sounds like the problem is with the fan, not your air conditioning system. If the fan only blows intermittently and it isn’t whining or noisy, then it sounds like you’ve got a loose connection either at your fan blower motor or at your ventilation control switch. For a few tips on diagnosing electrical problems like this, try reading our article about electrical problems here: https://gobdp.com/blog/diagnosing-electrical-problems/.

      Thanks again for your question!
      -BD Auto Pro

  176. I have a 2002 Chevy trailblazer, my line broke last year,I recently bought a new line. Can I put new line on and fill with freon and it will work or should I replace the pump also?

    1. William,

      Thanks for your question about your Chevy Trailblazer. You can simply replace the broken line and refill your system with freon. If the broken line left the system open to the atmosphere for any length of time you may consider having a vacuum drawn on the system to try and remove any contaminants before you restart the compressor to try and minimize any particles in your system or other things that could cause clogs or damage the compressor.

      Thanks again for your question!
      -BD Auto Pro

  177. Hi i got a f150 04 my ac was working just fine untill this noom i went to the gym n turn on my ac starting to wor n started smelling like pure freon from the vent n ac compressor started ti kick on n off i need help with that please anyone know what could be the issue

    1. Jose,

      Thanks for your question about your F150. Based on your description and the odor you’re smelling it sounds like you’ve got a refrigerant leak from your AC evaporator. Try using Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak and get your AC back to normal.

      Thanks again for your question!
      -BD Auto Pro

  178. Hi,I have a 03 Honda civic Ac only blows hot air. I tried recharging it with the can ,but still no cold air? When I put the gauge on it reads in read Alerts! What can it be??? Help plz it’s 103 n no ac?

    1. Vanessa,

      Thanks for your question about your Honda Civic. If you’re sure your system is full of refrigerant the problem could be a clog or a bad compressor. To check for these conditions you will need to measure the high side pressure with a set of mechanics AC gauges. If the high side pressure is high, it could indicate a leak and if it is too low it could indicate a bad compressor.

      Thanks again for your question!
      -BD Auto Pro

  179. I have a 2005 Hyundai Elantra the a/c gets cool when you start it but after driving a little it gets hot. The compressor stays on the whole time. Freon is full but the a/c lines are really hot. What do you think??

    1. Alan,

      Thanks for your question about your 2005 Elantra. To figure out what is going on you’ll need to measure the low and high side pressure in your AC system. Our best guess is that either the magnetic clutch or your AC compressor itself is going bad. If the compressor is functioning normally it should cycle on and off as your system requires it. A bad clutch or worn compressor would cause it to continually cycle.

      Thanks again for your question!
      -BD Auto Pro

  180. Hi my name is Lesley and I got a 1997 ford Taurus… I had called a mechanic and explained whats going on with my car and he told me it was that I needed a new compressor but I want a secound opinion… My a/c well turn on but it blows hot air out, so what do you think it is??

    1. Lesley-

      Thank you for asking about your Ford Taurus. Based on your description, it is a little difficult to determine where the issue may be. We recommend taking the vehicle to a second shop for a second opinion.

      Hope this helps!

      -BDP

  181. HI, I HAVE 2012 FORD FUSION SEL. I DAY RIDE THE AIR STOP BLOWING THEN CUT BACK ON. A FEW DAYS LATER IT NEVER CAME BACK ON. SO I GOT THE BLOWER MOTOR RE PLACE. NOW WHEN I TURN ON THE AIR I HEAR A PSSSSSS NOISE FROM UNDER THE HOOD WHEN THE AIR COMES ON. BUT IT ONLY BLOWS COOL AIR EARLY N THE MORNING AND AT NIGHT WHEN ITS NOT HOT OUT OR THE SUN NOT SHINING. IM THINKING ITS A LEAK BUT I WANNA BE SURE BECAUSE EVERYTHING WORKS FINE ITS JUST THAT PROBLEM IM HAVING AND I WANNA GET IT FIX ASAP

    1. Monique,

      Thanks for your question about your Ford Fusion. You might check to see if there is a possibility that your vehicle is still under a factory warranty to see if any other repairs would be covered at a dealership. It sounds like you’ve fixed the problem of the air not blowing by having your blower motor replaced, and the fact that your air isn’t very cool could be a few different things. You could start by checking to see if you have a leak by measuring the low pressure side of your air conditioning system. You can use the gauge on a refill can of refrigerant available at most auto parts stores. If you do find a leak, add Red Angel AC Stop leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) along with new refrigerant to seal the leak and keep your air conditioning system cold.

      Thanks again for your question!
      -BD Auto Pro

  182. Hi My 2005 T&C mini van’s AC is blowing hot air. It has a brand new compressor and drier, it has been fully charged. I was also told its holding a charge and there are no leaks however its still blowing hot air. What could the problem be and how can i fix it?

    1. Michelle,

      Thanks for your question about your 2005 Town and Country. There is a possibility you still have a problem with your air conditioning system, like a clog in the expansion valve or orifice tube. If you had a clog, you would probably notice an abnormally high pressure on the high pressure side of the system so you may consider having your mechanic check for that.

      The other possibility is that your problem is actually with your ventilation system and the ventilation system is stuck on “heat” even though you have it set to cool. If this was the case the AC lines running into your firewall would be cold and when you turn the setting from heat to cool you won’t hear the door moving. If this is the case you will have to inspect the air blend door and servo to see what is malfunctioning.

      Thanks again for your question!
      -BD Auto Pro

  183. I just added a whole jar of refrigerant and my truck is still blowing hot air. Everything seems to be functioning except it’s not cooling. Any suggestions?

    1. Marty,

      Thanks for your question about your truck. based on your description you could have a few different problems. The most common problem with any air conditioning system is a leak, so it’s possible that yours has a large leak and allowed all the new refrigerant you added to escape as you were adding it. It is also possible that your system has a large clog keeping the pressures from rising and dropping as their supposed to which would keep the cooling effect from happening. Lastly, you could have a bad compressor that isn’t raising the pressure in the system enough to function properly.

      In order to discover what is going on in your air conditioning system, you will need to hook it up to a set of mechanics AC gauges to check the pressures on both sides of your system. These pressures will be able to tell you if you’ve got a large leak, if you have a bad compressor, or any other problems going on in your system.

      Thanks again for your question!
      -BD Auto Pro

  184. I have an 09 Dodge Caravan. I know I have a small leak in the system due to checking pressures before. I did a temporary recharge on the system to get me by until the next payday, lol. Now, I have check the pressures again, and they seem fine. Almost as if the system is only leaking slightly as before. But, it is blowing warm/hot air. The fan turns on when the engine reaches temp, then continues to cycle on and off as normal. (thus telling me the fan is operational). When I turn the AC on, the fan only seems to run, as it did when the engine reached its temp. With the engine in a cold state and the AC turned on, the fan does not run… Relays are good. Could this be a PCM issue?? or even a possible clog or dirty coil issue?

    1. Paul,

      Thanks for your question about your 2009 Dodge Caravan. Anytime your compressor is running the fans, or at least one of them, should be running as well. The problem you’re having sounds like an electrical one so it could be a control module issue, or it could be an electrical issue like a bad pressure or temperature sensor shutting down your system or simply that the signal isn’t getting to the compressor to turn on.

      Thanks again for your question!
      -BD Auto Pro

  185. I have an Audi A3, when the outside temperature is in the 90’s the compressor doesn’t turn on (just blows very hot air) for about 10 minutes of driving then blows cool air (though not icy cold).
    If the outside temperature is in the 70’s the compressor starts right away, but still only blows cool (not cold) air.

    I think I may have read somewhere that the hotter outside temperature does something with pressures which may cause the clutch to not engage ?
    Could this be a pressure switch that’s gone bad ? Any idea where they are located on my car ?
    Aside from the clutch not engaging when it’s hot, what would I need to do to get the air running colder, compressor failure or re-charge the refrigerant and add a new dryer ?

    Thanks
    Will

    1. Will,

      Thanks for your question about your A3. It is possible that you’ve got a faulty pressure switch shutting things down on warmer days when the system pressures are higher, but if that were the case, you’d have the opposite problem of cool air at first getting warm as you drive on hot days.

      Your problem does sound more like a low refrigerant level or even your compressor going bad. We would recommend starting by checking your system pressures both on the low side and high side. These pressures can tell you if you’ve got a enough refrigerant, if you have a clog and if your compressor is working properly.

      Thanks again for your question!
      -BD Auto Pro

  186. When I turn my compressor on, sometimes it will blow cold and sometimes it won’t. It will be blowing normal warm air while driving and then all of a sudden start blowing cold. It is no particular time it does this. When I stop and kill the car for a few minutes at a store it will not work when I crank back up. Then after a few minutes of driving it will work again. Or it will start working immediately after cranking. Sometimes it goes weeks without working. Also most times when the compressor does decide to come on I will smell what smells like dust coming out of the vents. I live on a gravel road

  187. I have a 2007 Hyundai Santa Fe, the air-con started making an intermittent oscillating noise when running. Then the a/c stopped working altogether along with the noise, doesn’t get cold at all now. Can’t find any leaks. As it’s an oscillating sound, I’m guessing it’s the compressor that’s failed?

    1. Joel,

      Thanks for your question about your Hyundai Santa Fe. based on your description yes, it does sound like your compressor has failed. You can check the high and low side pressures to be sure. If your compressor has failed there would not be the normal pressure rise across the compressor.

      Thanks again for your question!
      -BD Auto Pro

  188. Hi I have a 2008 Honda CRV. My Ac is working fine and blows very cold air (colder then it used to be) when I start my car first thing in the morning (kept in garage). But blows warm air when I start it in the evening (kept in sun whole day in the office parking), Sometime it can turn back to cold after driving on highway for 20 -30 min. I showed it to honda dealer and they said the compressor relay is bad, it didn’t solve the issue. Then they find out that the Ac fan (the one on driver side, at radiator) is not kicking in. They changed it, they said that the system is fully charged that’s why blowing cold.
    But still the problem is not solved. Don’t know what to do. Looks like the compressor went on On/Off. Is it a compressor issue or some electrical. Already spent too much on it….Please help.

    1. Sam,

      Thanks for your question about your 2008 Honda CRV. The problem you’re experiencing could actually be due to your system being overfilled. If the system has too much refrigerant it could be tripping off on an over pressure or over temperature later in the day once your vehicle has been sitting in the sun and all the metal parts are hot. During normal operation, the compressor does turn on and off depending on outdoor temperature and the cooling load at the time. You may consider taking your vehicle back to the dealership you took it to originally since they didn’t get the problem fixed and see if they will inspect it again free of charge.

      Thanks again for your question!
      -BD Auto Pro

  189. Hello

    I have a BMW 320i 2009 model. suddenly it started to blow hot air through AC grills. and I realised that there is a leak in radiator and upper coolant hose. if I replaced those both, will it make cool air? is there any relation with those parts with AC system? Thank you

    1. Ge-

      Leaking antifreeze will not have an effect on the performance of your air conditioner.

      The first thing you should check is that the system has enough refrigerant as it may be leaking out. If it seems that the level is low or empty then you probably have a refrigerant leak. In that instance we recommend adding Red Angel A/C Stop Leak (http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) and then following it up with the proper amount of R-134a to fill the A/C system.

      Thank you!

      -BDP

  190. I have a 2011 mustang and my ac will blow meat freezing cold in the mornings until about 10am-7pm, during them hours my ac is hot and will not get cool, can anyone tell me what needs to be done? I have blown all the air lines out and drained the freon and added new and it worked for about a week and repeated the same course.

    1. Paisley,

      Thanks for your question about your Mustang. Our first question would be how you added the new refrigerant. Most vehicle AC systems require a certain amount of refrigerant to function properly of weighing the coolant you’ve added is the only accurate way to do that. It sounds like your system might be overfilled which would cause extremely high pressures in the system during the hot part of the day which could be tripping the system off on over pressure.

      Also, since you mentioned things changing for a short amount of timing but then acting up again you could also have a large clog in your system that got better after the drain and refill but now is causing problems again. You can check for a clog by measuring the high pressure side of your system.

      Thanks again for your question!
      -BD Auto Pro

  191. I have a 2012 Ford Taurus. The other day I noticed my AC going from cold to hot. As I accelerated it would go warm but once going it went back cold. Now today it’s blowing nothing but hot air. I put more refrigerant in it and the gauge was showing in the red at 100 psi.

    1. Jeremy,

      Thanks for your question about your Ford Taurus. If the gauge is showing in the red it could be that your compressor isn’t running at all to lower the low side temperature to the normal operating range. Based on your description of your AC was acting before it stopped working you could have a bad AC compressor or an electrical problem with your car. To check the compressor you’ll need a set of mechanic’s AC gauges to check the high and low side pressures in your system.

      Thanks again for your question!
      -BD Auto Pro

  192. Jerry says

    Have a 2004 Toyota 4 Runner V8 4wd. w/120k. (this vehicle does NOT have dual A/C controls). A/C has worked perfect until two days ago and temps reached 95+. Problem is drivers side vents blow warm air and passenger side vents blow the cold air I am used to. I have been told that being slightly low on refrigerant can cause this, and have also been told possible bad door actuator control. Your thoughts?

    1. Jerry,

      Thanks for your question about your 4Runner. The problem you’re describing could be caused by low refrigerant, but if that were the case the difference in temperatures between the driver and passenger side of your truck would be minimal. If the temperature difference is drastic, we would recommend looking into a bad door actuator or possibly even a damaged air blend door.

      Thanks again for your question!
      -BD Auto Pro

  193. My 2009 Honda Civic is not blowing out cold air. It have a brand new compressor for a month. My husband and I are out of town and the air was blowing cold air but the next day it have stopped

  194. hi, I have a 2010 Honda Civic and when I turn the Ac on it blows hot air. the compressor is running, both fans are running, I hose down the condenser, the freon pressure is fine, relay checked out fine. replace the Ac filter and I’m still having the same problem. any thoughts what can be causing hot air to blow inside? please help!!

    1. Mark,

      Thanks for your question about your Honda Civic. You might have a problem with your ventilation system where your air blend door is sending the cooled air from your AC system over the heater core before blowing it out of your vents. If this was the case you would be able to feel the AC lines going into and out of the cabin getting cold while your system was running even when the cabin air is blowing hot.

      If that isn’t the case, you might have a very large clog in the system or a failed expansion valve. You would have to measure your system’s high side pressure to help you figure out if that is a problem.

      Thanks again for your question!
      -BD Auto Pro

  195. Hello
    Just had my entire AC system replaced (97 toyota camry 4cyl), so theoretically, there shouldn’t be a compressor, freon level, or leakage issue.
    Anyway, my issue is that in the mornings lately, the ac does not work. There seems to be more dew/moisture from when it was replaced a couple of months ago (vehicle is parked outside). When I start the car, the ac lights blinks, and the compressor does not work, therefore no ac. However, after driving for a while, the ac will begin to work. Feels plenty cold enough, it’s just frustrating that it doesn’t work for the first 10-15 minutes of driving.
    I brought it back to the mechanic that replace it, and he said it may be the pressure sensor is bad. After reading comments on here and another forum, it looks like the pressure switch is related to refrigerant level/pressure and not so much humidity or moisture. Another site said it might be belt slippage due to wet conditions. And, on here I saw something about possibly a fan not working.
    Thank you in advance for your assistance.

    1. Wes,

      Thanks for your question about your Camry. AC systems can be a mystery, especially when it comes to electrical issues like it sounds like you’re having. It’s unlikely that the belt is slipping otherwise you’d hear some other strange noises and your AC light would stay on. It could be a pressure switch, you’re correct in that sensor is reading refrigerant pressure, but if it is bad, it could still be causing the problem. Electrical issues often come and go as your car warms up as a warm sensor may work while a cold one wouldn’t. I know it sounds crazy, but that’s why problems like this are hard to track down.

      It is also possible that your fans aren’t coming on to cool the condenser. If that is the case, your AC won’t work until your car is moving and air is passing through the condenser. The fans should turn on when you press the AC button and run intermittently from there. If those aren’t turning on you can try checking the fuses and relays for the fans.

      Thanks again for your question!
      -BD Auto Pro

  196. I have a 2002 Nissan Sentra. Recently it started to blown hot air, so i got my thermostat replaced thinking that it was that. It did look pretty beat when the mechanic showed me. Also they drained my coolent and added new. It blew cold air for a day after that it started to blow hot air. Winter is slowly aproching i really woundnt need the a/c i was just wondering if it would effect the heater if i do turn it on.

    1. Diana-

      Thank you for asking about your Nissan Sentra. Based on your description, you may be experiencing a slow refrigerant leak. The functionality of your heater and A/C are working from two different systems. The heater core is a component of the cooling system, which uses antifreeze, and would not be affected by the A/C system. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

    1. Teressa-

      The first thing you should check is that the system has enough refrigerant, using an A/C gauge, as it may be leaking out. If the level is low or empty then you probably have a refrigerant leak within the system. In that instance we recommend adding 1 can of Red Angel A/C Stop Leak (http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) and then following it up with the proper amount of R-134a to fill the A/C system (you may check the specs in your owner’s manual to ensure the proper amount is added).

      Thank you!

      -BDP

  197. Hello. I recently refilled my ac and wen it was not filling well they changed one of the resistors near the glove box. The problem I have now is that even when the temperature and heat dials are off I can still feel cold air coming through the vents and at times at high speeds I see something like smoke coursing out through the vents. The ac works well when it is on and no more problems with it. Please help. I use a Honda Accord 2003.

    1. Patrick-

      Thank you for asking about your Honda Accord. Do you have it set to recirculate or fresh air? If you have the vents set to fresh air, it would still allow air to flow, and would pull in more air through the cabin at higher speeds, especially if you have a window or sunroof open. If that does not correct the issue, we recommend taking the vehicle in to a A/C specialist for a possible A/C relay replacement.

      Thank you!

      -BDP

  198. My Elantra 2007 air conditioner stoped working so I took it to repairer , he figured the Refrigerants level was low so he filled it , initially it worked fine after the fill but later all of a sudden the compressor discharge all the Refrigerants . I just don’t know what is happening please help

    1. K’si-

      As you have mentioned, it sounds like you have a refrigerant leak. Once the refrigerant gets low enough the compressor will no longer kick on. We recommend applying Red Angel A/C Stop Leak and Conditioner (http://store.gobdp.com/a-c-stop-leak-aerosol-00222/). Red Angel will work to seal any leak points in the system to allow the refrigerant level to stay full. After the product has been installed you will then recharge your A/C system to the proper level with R-134a.

      Thank you!

      -BDP

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