My Car AC is Not Blowing Cold Air

Summer isn’t over yet!  Especially if you live in the southern portion of our country or other hot climates you are well aware that, although fall is approaching, the days at the beach or lake or not quite over!  The summer sun actually stays quite hot well into the fall in most parts of the country, and even if you’ve had some cooler evenings lately, temperatures are likely to stay warmer for a few more weeks before the leaves change and fall really settles in.

foggy windshield www zigwheels comWith the warm temperatures still around it is important to keep your air conditioning system in good working condition.  Your air conditioning system in your vehicle is an important part of keeping you comfortable but it also important to your safety.  Most new cars automatically turn on the air conditioning system anytime you have your front window defroster on.  The air conditioner in your vehicle cools the air your vehicle draws in from outside which also causes the moisture in the air to condense.  That is why you see your car dripping water from near the firewall when the air conditioner is running on a warm humid day.  When this cool air is reheated by your vehicle’s heater core it is warm and very dry which makes it ideal for removing condensation from the inside of your windshield.  Having a properly working air conditioning system is important for your comfort, but also for your safety and ability to clear your windshield even in cooler months.

If you find your AC is not blowing cold air it is important to identify the problem with your AC system and fix it quickly for your comfort and your safety.  One of the best indicators to help you discover the problem with your air conditioning system is whether it started blowing warm air quickly or if your air conditioning system started working less and less and overtime.  In the fall, since you are likely not using your air conditioner every day, it can be difficult to tell if it stopped working all of the sudden or over time.  Even if you don’t know the duration of the problem with your air conditioning system, the most likely cause for your air conditioning system malfunction is a refrigerant leak.  The refrigerant used in cars and trucks today is a gas at atmospheric temperature and pressure and can leak out through even the smallest of openings or cracks.  Also, since the air conditioning system in your car is mounted to a moving, vibrating vehicle that is exposed to the elements and road debris it is not unusual for hoses and lines to come lose or O-rings start to leak over time.

AC LeakThe complexity of your air conditioning system and the location of all the lines, hoses and equipment it can be difficult to discover where your refrigerant is actually leaking from.  One option is to go to your local auto parts store and pick up an ultraviolet dye, an injector to get it into your air conditioning system and an ultraviolet light.  You can inject the ultraviolet dye into the AC system and let the AC run for a few minutes.  Then park your vehicle in a dark garage with all the lights off.  Use the ultraviolet flash light to inspect all the connections, hoses, lines and all sections of the AC condenser and evaporator.  The UV dye should have leaked out at the leak point and shown up under your flashlight.  Now that you’ve discovered where the leak is you can go about replacing the damaged components.

A much simpler and less expensive option would simply be to seal the leak, no matter where it is and without having to find it first.  Start by adding BlueDevil Red Angel AC Stop Leak to your air conditioning system either using the aerosol can with supplied coupler or the liquid stop leak and our AC oil injector.  Once BlueDevil Red Angel AC stop leak is in your air conditioning system it will circulate with your refrigerant until it reaches the leak.  The temperature differential at the leak will cause BlueDevil Red Angel to form a chemical weld at the leak sealing your air conditioning system quickly and permanently without any more effort from you!  Once your leak is sealed simply refill your AC system with the proper amount of refrigerant and your vehicle is back to being safe and comfortable.

Red Angel AC Stop Leak & Conditioner

You can pick up BlueDevil Red Angel in the aerosol or liquid form at any of our partnering local auto parts stores like:

  • Advance Auto Parts
  • AutoZone
  • Bennett Auto Supply
  • CarQuest Auto parts
  • NAPA Auto Parts
  • O’Reilly Auto Parts
  • Pep Boys
  • Fast Track
  • Bumper to Bumper Auto Parts Specialists
  • S&E Quick Lube Distributer
  • DYK Automotive

You can also purchase BlueDevil Red Angel AC Stop Leak from BlueDevil online:

BlueDevil Red Angel Aerosol
BlueDevil Red Angel Liquid
BlueDevil Red Angel Oil Injector

Pictures courtesy of: www.cumminsforum.com and www.zigwheels.com

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116 responses to “My Car AC is Not Blowing Cold Air

  1. I Have an 1981 Chevy Caprice I Recently Took out R12 Tank to a 134…..New Vacuum Line and Belt, It Worked Great For a Week and Now it’s Workn But Blowing out Warm Air….WAT IS THE PROBLEM!!!!!! Mr.81

    1. William-

      Thanks for your question about your 1981 Caprice. The answer to your question depends on lot on how the R-12 to R-134a retrofit was completed. R-12 systems and R-134a systems have the same basic working principle but they use different types of oil to lubricate the system, work at different pressures and usually require different orifice tubes and dyers. If you simply evacuated R-12 from your system and added R-134a then you probably have a clog somewhere in the system due to still have mineral oil in the lines. Also, R-134a has a higher working pressure than an R-12 system so you may simply be hitting the high pressure cutoff. Lastly, some compressors are not compatible with R-134a because there seals will deteriorate quickly so you may have to install a new compressor to accommodate the new refrigerant.

      -BDP

  2. My air conditioning in my car started blowing warm air all of a sudden one day recently. After a few days of that, I took it to be charged and it has only been a few days since and it is blowing hot air today. It is Saturday, and I can’t get it checked for the dye they put in there until Monday. What could the problem be seeing that within just a few days of charging it, it went back to not working, not blowing cold air?

    1. Michelle-

      It sounds like you have a refrigerant leak. We recommend adding a can of the Red Angel A/C Stop Leak and then recharging the system with the proper amount of refrigerant. This should stop any leaks in the system and allow your A/C system to hold the Freon.

      Thank You!

      -BDP

      1. I have a 2002 mitsubishi lancer and when i bought the car the ac wasnt working i just finished putting in a can of a/c pro and nothing still blowinf hot air and in the pressure gauge goes up but within time goes back down to zero idk whats going on

        1. Angel,

          Thanks for your question about your 2002 Mitsubishi Lancer. It sounds like you’ve got a large leak in your AC system if your system pressure is going back down to zero that quickly. You can try using Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak but you will have to add it quickly after you add more refrigerant so your AC system is running.

          Thanks again for your question!
          -BD Auto Pro

      2. I have a 2002 buick lesabre custom and I got the radiator changed. My ac is now blowing out hot air. before I had the radiator changed, my ac was working cold and perfect.

        1. Laseane,

          Thanks for your question about your Buick Lesabre. It could just be a coincidence, but a significant amount of the AC components are located right near your radiator so it is possible that the mechanic who installed your radiator bumped or broke one of the components in your AC system while installing the radiator. Our recommendation would be to take your vehicle back to that mechanic and have them check their work and look for AC leaks around your radiator.

          Thanks again for your question!
          -BD Auto Pro

    2. I had my air conditioner in my 1995 Toyota recharged a few years ago with Freon. All of a sudden it stopped blowing cold air. What could be wrong with it? Thanks

  3. I have a 2006 Dodge Ram 1500 with a 4.7 v8 engine in it. my AC started acting funny about 6 months ago it would not blow cold air while sitting but once you start going after about 30 mph it would start blowing cold air. I figured that my fan motor was probably going out. As of yesterday it now no longer blows Cold air at all, just cool air what could be the problem?

    1. Daniel-

      Thanks for your question about the air conditioning in your Dodge. The problem you are having does sound like it could be a result of your AC fans as that can cause your AC to malfunction at low speeds due to a lack of cooling in the condenser. If your fans turn on when you turn the AC on, this could also be an indication that your compressor is starting to wear out and it would only be able to build enough pressure at higher engine RPMS, like when you’re at cruising speed. To see what is going on in your system you’ll have to use a set of mechanic’s AC gauges to measure the high and low pressures. If your high pressure side measures too low, then your compressor is worn out and should be replaced.

      -BDP

  4. Hi,
    My a/c is blowing warm air. The compressor is fine, line is very cold, fan is working. It was blowing very warm air prior until I just cleaned the temperature sensor/probe which I pulled out of and reinserted into evaporator coil. It helps a little, no more very warm air, just warm to cool. The probe had deposit build up and I used emery clothe to clean it down to copper surface. I have a 2002 dodge intrepid se, with manual and auto temperature setting. I just wonder if the probe is bad eventhough it helped a little after cleaning it? Does the resistor control the air temperature in any way other than just blower speed control? I don’t know everything, but I know some stuffs about a/c. I feel if someone can give me a push in the right direction as to what the issues I might be having and take it from there. The Freon level is in the ‘blue zone’ of the gauge, Compressor is new, 3-4 years old.

    Thank you. Hope you can guide me.

    1. Frank-

      Thanks for your question about your Dodge Intrepid. The next thing we would recommend checking is the operation of the temperature blend door in your ventilation system. There is a flapper door controlled by your temperature control knob and a servo motor that directs air either over your heater core or lets it bypass the heater. It sounds like the door in your system may be stuck slightly on “heat” which will allow the conditioned air to be reheated before it is blown through your vents. Check the operation of this door and for clogs or anything else that would cause it to stick.

      -BDP

  5. My 2010 Lincoln t/c car a/c is blowing hot air when I first turn it on, for about 2 minutes before it gets cool, then it’s not cold, just keeps you from burning up. But on occasions it will blow cold for a little while, then just cool again. What do you recommend? Thank you.

  6. Hi, I have a dodge stratus. My AC in my car just stops blowing air when it is in no. 1 and 2, but when i turn it to no. 3 it works just fine. Do you know what could be the problem? Before it was just no. 1 that doesnt blow air and now its no. 2 also. thanks

    1. Juliet,

      Thanks for your question about your Dodge Stratus. The problem you’re having sounds like a blown blower motor resistor. The resistor is what creates the different fan speeds and it sounds like the first 2 parts of yours have blown. They are an inexpensive part and usually something you can fix yourself with some simple tools.

      Thanks again for your question!
      -BD Auto Pro

  7. The a/c in my KIA Sorrento LX 2008 isn’t working properly.. The a/c blows warm then will turn cold after minutes of driving or sitting. Then it can go from cold to warm while driving all on its own.

    1. Myron,

      Thanks for your question about your Kia. Since your problems are so intermittent it is difficult to tell exactly what is going on. The best thing to do would be to get the pressure in your system checked both on the high and low side to see if you have enough refrigerant, to make sure the compressor is doing its job and there are no clogs. If all that checks out, then you most likely have an electrical problem with your ventilation control unit.

      Thanks again for your question!
      -BD Auto Pro

  8. I have a 2005 Chevy Cavalier. The AC fuse in the engine compartment blows every time I replace it. It is a 10A fuse. I’ve tried using a 15A but the same thing happens. I took out the condenser and everything looked fine. After i took it out i refilled the AC lines with Freon. Still nothing changed. Whenever I turn the AC switch on inside the car the light pops on above it but it only blows cold air. I also cleaned out the air filter thinking it was that yet nothing changed. Any ideas…. ?

    1. Scott,

      Thanks for your question about your Chevy Cavalier. It sounds like you’ve got more of an electrical problem on your hands than a problem with your AC. For starters try reading our article about electrical problems here: https://www.gobdp.com/blog/diagnosing-electrical-problems/.

      In your case, it sounds like something is grounding out the signal wire to the AC compressor. It could be a crossed with another wire, a brake in the wire, or something shorting inside the compressor.

      Thanks again for your question!
      -BD Auto Pro

  9. I have a 2008 Toyota Corolla and my ac was working fine a month ago, but now it doesn’t blow cold air, it just blows air with a slight breeze.

    1. John,

      Thanks for your question about your 2008 Corolla. It sounds like your problem is with your blower motor rather than your AC system. If the air isn’t blowing from your vents, try checking the resistor pack and the wiring connections between your fan switch, the resistor and the blower motor.

      Thanks again for your question!
      -BD Auto Pro

  10. 2001 Cadillac STS with a slow oil leak for the past couple of years, my mechanic (that I no longer have because I moved out of state to FL) told me he’d have to pick up engine to fix for about $880. So I just get it topped off in between oil changes (north star engine). Now my coolant has a slow leak, already had radiator replaced because of a crack months ago, so just keeping coolant in my trunk now. Now a/c blowing air that is the temp of the outside air, not cool/cold at all, even feels warm when I put my hand up against the vent. I can’t afford any fixes now or coolant leak would be fixed. What should be my next step here, freon? Or find a mechanic? Even though I can’t afford it.

    1. Deona,

      Thanks for your question about your Cadillac STS. With all the problems with your vehicle, it may be more cost effective for you to consider trading your STS in for a newer vehicle rather than putting all the money into fixing these problems. Since the AC not working isn’t affecting the reliability of the car, we would recommend stopping the coolant and oil leak first if you’re going to try and repair this car. For the oil leak, add BlueDevil Oil Stop Leak (available here: http://store.gobdp.com/oil-stop-leak-49499/) to your engine oil to help seal that leak. As for the coolant leak, it would be best if you could locate the leak first. If it is coming from a hose, we would recommend simply replacing that hose as that would be fairly inexpensive. If it is coming from a gasket, we would recommend using BlueDevil Pour-N-Go (available here: http://store.gobdp.com/pour-n-go-head-gasket-sealer-00209/) to seal that leak.

      Thanks again for your question!
      -BD Auto Pro

  11. HI I have an 05 acura rsx and this summer when I got it it wasn’t blowing cold air. I had AC pro and it said the refrigerant pressure was fine so I didn’t add any and now that its cold outside it doesn’t blow hot air. Once the car warms up it will blow kinda like room temperature air which still really isn’t enough to warm the inside of the car. Any ideas to why it does that?

    1. Larkin,

      Thanks for your question about your RSX. Since both your heat and AC don’t work, the problem is probably with your HVAC controls. There is a door that controls whether the cabin air is blown over your heater core or your AC coils and it sounds like that is stuck half way between each and not really cooling or heating the air. This could indicate a problem with the controls themselves or the servo motor that controls the door.

      Thanks again for your question!
      -BD Auto Pro

  12. I Have a Toyota sequoia my ac was working good but I turned it off because it was cold in the morning then when I turned it back on when the day was warming up it just didn’t blow cold air no more but in the back it blows cold air what can the problem be I went to a car shop to check if it had Freon and they told me it was good

    1. Boli,

      Thanks for your question about your Sequoia. It sounds like the problem is actually with your ventilation system, not your AC since your rear AC still works. There is a door that directs the ventilation air in your car either over the AC coils or heat core. It sounds like when you turned the heat on the other day the door got stuck in the “heat” position. This could be a problem with your ventilation controls or with the servo motor that actually moves the door.

      Thanks again for your question!
      -BD Auto Pro

  13. Hi, I have a 2008 VW Jetta that it has a delayed of 5 to 15 to cool the AC. When I turn the wipers on it will cool faster then it cools for like an hour or so and goes back to the same. What do you think is the problem? Thank you.

    1. Janette,

      Thanks for your question about your Jetta. We’re having a hard time piecing together why having your windshield wipers on would help your air conditioning cool more quickly, but usually slow cooling is an indication that you’re slightly low on refrigerant. We would recommend picking up a bottle of refrigerant with a gauge on it to see if you’re low on refrigerant and to top off your system. If that isn’t your problem, then you may have to take your car to a mechanic to get things checked out.

      Thanks again for your question!
      -BD Auto Pro

      1. Thank you. Yes, it helps the ac starts cooling when I turn on the wipers water. I took it to a mechanic and said is the compressor and want to charge me lots of $$$ to replace it but I do not know what to think. Thanks again for replying.

  14. I have a 2008 Kia Sorento and just the other day I was warming it up and had the heater on and before we could take off the heater just turned off. No cold or hot air comes out. The engine isn’t making any noises all still runs good just no cold or hot air blowing out. Please advice

    1. Luis,

      Thanks for your question about your Kia Sorento. It sounds like you’ve got an electrical problem with your ventilation system blower motor. Start by checking the blower fuse which should be in a fuse panel somewhere under the dashboard. If that fuse is good, check the blower motor resistor next. If that resistor is also in good shape then you probably have a burnt out blower motor.

      Thanks again for your question!
      -BD Auto Pro

  15. Hi I have 2009 Chevy aveo5 the problem is that is not cold as it supposed to be it does get cool but not cold enough the condesor is new so I dont know what It will be I need help please thank you in advance

    1. Lorenzo,

      Thanks for your question about your Aveo. If you’re not getting proper cooling it is likely either from a clog in your system or a leak. If contamination got into your system when you changed the condenser, it could have become a clog causing a high pressure and a malfunction. You may also have a small leak, or the proper amount of refrigerant was not added after you installed the new condenser. To find out which is your problem you’ll need to measure the high and low side pressures to make sure they’re within specification.

      Thanks again for your question!
      -BD Auto Pro

    1. Philis,

      Thanks for your question about your Audi A3. If your coolant level is full, then the problem for the cold air may be because your heater core is clogged or because your HVAC system is malfunctioning. You can try flushing your cooling system using BlueDevil Radiator Flush (available here: http://store.gobdp.com/radiator-flush-00204/) to try and clear any blockage to see if that gets your heat working again. If that doesn’t work, then the problem is most likely with your HVAC system. There is a door in your air ducts that directs air over your heater core and if is malfunctioning or stuck it will allow the air to bypass the heater core and blow cold.

      Thanks again for your question!
      -BD Auto Pro

  16. Sounds like you guys give a lot of good advice, so I’ll ask my question. 2005 Sequoia…a/c worked great last summer, blew really cold air. Went to turn it on a few days ago, nothing. The ac light comes on, but the compressor doesn’t kick on. Where should I start? I’ve tried swapping relays so far, but that didn’t fix it. There isn’t a fuse (that I saw, anyway), just the relay that says “ngclt”, or something close to that. I was thinking about bypassing the pressure switch, but I don’t want to mess anything up. Advice? Thanks!

    1. Chris,

      Thanks for your question about your Sequoia. If the light comes on your AC system, it sounds like the electrical side of things is working correctly. To prove that you could try testing for voltage at the signal wire attached to the compressor when the AC is switched on. It sounds like it’s been a while since you’ve used your AC so it’s possible a slow leak has allowed your refrigerant to leak out. We would recommend checking the low pressure in your system next to determine if you’re simply low on refrigerant. You can do that with a set of mechanics AC gauges or the gauge on a refill can of r-134a you can get at most auto parts stores.

      Thanks again for your question!
      -BD Auto Pro

  17. I have a 2006 maxima and I recently charged my ac on a Friday when temperatures reached a high of 86. So that same Friday night I went out to the movies and needed a lil heat circulating through the car. Saturday I went to turn the ac on and it was back to blowing hot air. This was a 24 hour period. What could be causing this problem? I don’t want to keep spending money for it to stop working as soon as I use heat. But my rear vents blow out cold air.

    1. Desirea-

      It sounds like you may be leaking refrigerant and when it gets low you no longer get proper cooling within your car. We recommend adding a can of Red Angel A/C Stop Leak (http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) and then following it up by adding the proper amount of R-134a. The Red Angel will stop any leaks so that the refrigerant stays in the A/C system and allows for maximum cooling.

      Thank you!

      -BDP

  18. I have a 1988 Ford Crew Cab Dually and have replaced the compressor, evaporator, and had the system fully recharged. Checked for no leaks. It’s the older R-12 Freon. It will not blow cold. I’ve read some other comments about a “flapper door” being stuck. Could this be my problem? What else could it be? The fan motor on the blower seems to work properly, with all three speeds. Thanks. Hope you can help me.

    1. Steven,

      Thanks for your question about your Ford truck. It is possible that your problem is with your HVAC system, not the AC system. There is a flapper door that directs air either over your heater core or over your cooling coils. When replacing the evaporator, they should have noticed if this door was broken, stuck or disconnected. However, you can check for sure by getting under your dash and manually moving the door. It should be at the end of a cable connected to the temperature selector lever in your dashboard.

      The other possibility is that your expansion valve in your system is clogged. If this is the case, the refrigerant would expand too slow to achieve the cooling effect which would make your AC blow warm. You would have to check your system pressures to prove that is the problem.

      Thanks again for your question!
      -BD Auto Pro

  19. I have a 97 buick century custom. For some reason the ac on the passenger side comes out super cold and on the driver side it’s less cool and warm. I can’t figure it out. During the day living in florida it’s a nightmare. Can’t get the car to cool down. It’s to the point having the window down in 90 degree weather is preferable. It used to blow very cold on both sides. Now only the passenger. It’s not so bad at night the car doesn’t have to take time to cool down.

    1. Tavia-

      Thank you for the question about your Buick. The climate control system in your vehicle 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, the 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, dashboard, 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 fairly easy job.

      Thank you!

      -BDP

  20. I have a 2002 Toyota harrier the ac works fine for two weeks after it was recharge with free on. Then goes back to blowing hot air. The technician puts a dye in which we could not see any impression of leaks but cools for a few weeks then back to hot air. What can this problem be? I look forward to your help.

    Thanks
    In advance
    Carlous

  21. I have a 2002 Acura TL-S. I just replaced the AC compressor and the AC is working fine if the outside temperature is below 87F (+-4). However, it only blow a very light cool air when the outside temperature is above 85F. I replaced two AC sensors for fan and AC and it still did not fix the problem. Please advise. Thank you.

    1. Tom,

      Thanks for your question about your TL-S. Based on your description of the problem, there may a few different things causing it. First your drying may be clogged and on warmer days it doesn’t allow the proper refrigerant flow and your system stops functioning. It could also be a faulty pressure switch in your system that shuts things down on warmer days when your refrigerant pressure is higher. Lastly, it could also be a bad compressor clutch that doesn’t function properly on warmer days so your compressor won’t engage causing the warm air to blow.

      Thanks again for your question!
      -BD Auto Pro

      1. Thank you for answering my question! I wait for the Summer was over to make sure my observation is correct. My car’s AC compressor engaged no problem during the hot day. However, I noticed that if I parked my car in a shade then my AC was working fine even when the outside temperature was near 100F. Plus, I placed the AC temperature control knot in Auto, not Full Auto. The problem existed only when I parked my car in a direct sunlight spot when the outside temperature > 87F, thus the car’s inside temperature was very hot. Thank you again!

  22. I have a 2002 Ford Taurus and my I’m getting cold air in the winter and hot air in the summer. It almost like the outside air is just running right into the cabin before without being cooled or heated. I got the compressor fixed but the problem persists. Can you help guide me in the right direction?

    1. Kera,

      Thanks for your question about your 2002 Ford Taurus! The problem you’re having sounds like it may have more to do with your HVAC system then your air conditioning system. In the air ducts in your car there are different doors and flaps to control where the air goes and if it goes over your heating or cooling coils. If those doors and flaps aren’t functioning properly, then the air may just be blowing in from outside and bypassing those coils not getting heated or cooled. To check and see if this is the problem, you would have to remove some of your dashboard and AC ducting and check the operation of the flaps and doors.

      Thanks again for your question!
      -BD Auto Pro

  23. HI! I drive a 2006 Kia Sorento and my a/c has been getting less cool over time. It doesn’t blow out hot air, but it’s more like room temperature air. I’m not sure what to do with it. It’s getting summertime here in the south and I need my air conditioner.

      1. I recharged my A/C with refrigerant, but it hasn’t started blowing cold air yet. How long does it usually take to start working?

        1. Amber-

          The A/C should be blowing cold air almost immediately after a recharge. From the sounds of it, you may have a refrigerant leak. We recommend using the Red Angel A/C Stop Leak & Conditioner, found here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/ . The product will seal a system that can hold at least 5 inches of vacuum for 25 minutes. Feel free to contact our technical support line at 888-863-0426 with any other questions.

          Thank you!

          -BDP

  24. Hi just took my 2007 Saturn Outlook to the shop because over time it started blowing hot air. I went in asking for freon the mechanic returned saying my compressor was out and needed replacing. Gave me a huge estimate, however on my way home the air is working just fine. I reviewed my receipt which indicates the topped off the freon. My question is would freon still work to cool car if my compressor is broken? Or being that I’m a women are these mechanics out to make a buck?

    1. Libby,

      Thanks for your question about your 2007 Outlook. It is possible that the mechanic fixed your problem by topping off the refrigerant, and a slow leak leading to a low refrigerant level would caused the symptoms you’ve experienced. A bad compressor would lead to a lower than usual pressure rise across the compressor so you could try asking your mechanic what the pressures were that he measured and what they were supposed to be, or what other indications he looked at to lead him to the conclusion that you needed a new compressor. You may also consider having another mechanic in town giving you a second opinion.

      If you do find a slow loss of cooling power again you can try adding Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to seal the leak, then have your system recharged, so you don’t end up without AC again.

      Thanks again for your question!
      -BD Auto Pro

  25. I have a 2004 monte carlo and when i turn on the a/c air comes out but it comes out hot, what can be the problem?

  26. I have an 06 escalade. The front vents stopped blowing any air but the rear ac still blows.. none of the front works tho, not the defrost, foot, or vents.. when you pop the hood it sounds like air is coming out of the ac lines.. half the line is warm the other half is freezing cold.

    1. Courtney,

      Thanks for your question about your Escalade. Based on your description, the problem you’re having sounds like it has more to do with your ventilation system then you’re air conditioning system. If air has stopped blowing all together you should check the fuse and switch for your blower motor. If the blower is working you may try resetting your ventilation control system or checking the operation of the blend door or other ventilation control doors.

      Thanks again for your question!
      -BD Auto Pro

  27. I have a 2007 Ford Fusion, it blows hot air when I turn on the AC, I thought I needed some freon but that wasn’t the case, I also thought it was the AC compressor but I was told by a mechanic that my compressor was in good condition. I’m not sure what the issue is, Any idea on what is going on with my car? Any help is much appreciated, Please I need help figuring out what it is that is wrong with my car. Thank you

    1. Donald,

      Thanks for your question about your Ford Fusion. The issue you’re having could be due to a clog in your AC system that is not allowing the cooling effect to happen at the expansion valve. To prove this, you would need to measure the pressures around your system to find the clog. The mechanic that checked your AC compressor should have found that if that was the case and the proper procedure was used to check your compressor.

      If that isn’t the case, the problem could actually be with your HVAC controls rather than the AC system. If the air blend door is stuck in the “heat” position the cool air would be reheated by the heater core and blow warm air from your vents. You could be able to check the operation of the air blend door without removing much of your ventilation system.

      Thanks again for your question!
      -BD Auto Pro

  28. We have an 09 Buick Enclave, we had a new a/c put on a few months ago now it’s blowing hot air it works sometimes we it wants too and has plenty of freon. The back air is blowing only hot air.

    1. Kristie,

      Thanks for your question about your 2009 Buick Enclave. If your sure your AC system has plenty of refrigerant and is working intermittently, then the problem could be an electrical fault. If you have a bad pressure switch in your system it could be shutting off the compressor inadvertently. Since you mentioned the back only blowing hot but the front working intermittently it could also be a problem with your ventilation system not properly moving the air blend door from the “heat” position to the “cool” position.

      Thanks again for your question!
      -BD Auto Pro

  29. I have a 2007 Dodge Caliber . My ac isn’t blowing cold . Seems to hold refrigerant ok . The top line gets cold ( you can see and feel that ) not sure what to do . Compressor comes on . Just had a guy work on it he supposedly changed compressor , drier and flushed it . It is actually showing it is overfill of refrigerant .what could be the problem?
    Thanks

    1. Mindy,

      Thanks for your question about your 2007 Dodge Caliber. If the top line of your AC system gets really cold (freezing to the touch and has condensation on it) then your AC system is probably working correctly and the problem is with your ventilation system. If your air blend door is stuck in the “heat” setting it will reheat your air conditioned air causing it to blown warm. If the top line is just a little bit cold, then the problem is still in your air conditioning system. If this is the case, based on the new components you have, you could have a bad expansion valve, or it could also be that your system is overfilled and tripping off on a high pressure condition causing it to not blow cold.

      Thanks again for your question!
      -BD Auto pro

  30. I have a 2006 Scion tc and was having trouble with the A/C blowing out warm humid air, so I brought it to an auto repair shop, where they identified the compressor as the failing component and replaced it-everything worked fine afterwards, the A/C was blowing out very cool air and performing as expected, then about three months later it suddenly started blowing out hot air. I’ve ruled out the compressor, as it is brand new-now I am left with a myriad of other components that could be the culprit. I have almost zero knowledge about A/C systems-any suggestions at where would be the lowest level at which I could start troubleshooting? Thank you in advance for any help you can provide.

    1. Gurney,

      Thanks for your question about your Scion Tc. The most common problem with air conditioning systems in cars is to have a refrigerant leak. You can most easily check for that by purchasing a small refrigerant refill can with an attached pressure gauge from your local auto parts store. If you find a low pressure and your system starts working when you add more refrigerant, then you’ve proven that you’ve got a leak. If that is the case add BlueDevil Red Angel AC Stop Leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/)

      If you don’t have a low refrigerant level, it could also be a clog in your system, most likely in the expansion valve or dryer. To prove this you would need a set of mechanics AC gauges to measure the high pressure side of the system as well.

      Thanks again for your question!
      -BD Auto Pro

  31. Hello. I have a 1994 Honda Accord and the ac in my car does not work. When I turn my a/c on it blows hot air and the fans don’t run. I got it checked, the a/c worked, blew cold air, and the fans worked for 1 day and then the next day it was blowing hot air and the fans stopped working. What can be the issue with my car a/c???

    1. Sarah,

      Thanks for your question about your Honda Accord. It sounds like you’re having an electrical problem with the fans in your car. You can start by reading our article about diagnosing electrical problems here: https://gobdp.com/blog/diagnosing-electrical-problems/ . Our guess would be that the shop you took your car to replaced a fuse or relay that was shorted out to get your fans working again, and that fuse or relay has shorted again. If that is the case, then there is something causing the fans to draw excess power and blow fuses. That could be due to your fan motors being old and worn out, or an old wire or connector creating a lot of resistance causing the power draw.

      Thanks again for your question!
      -BD Auto Pro

  32. I have a 2010 f-150….when I turn on the a.c. passenger side blows somewhat cool/warm air but the driver side blows hot air. is there anything I can do that won’t cost me an arm and a leg to fix?

    1. Joy,

      Thanks for your question about your F150. The problem you’re describing sounds like it is actually with your ventilation controls, not your air conditioning system. The most likely cause would be if you have dual zone climate control and the air blend door actuator has failed on driver’s side. The replacement part for this should be relatively inexpensive but the labor costs could be high as it may require removal of a significant amount of your interior to get to it. Our recommendation would be to call a few shops in town and get a quote for that job.

      Thanks again for your question!
      -BD Auto Pro

  33. Hi BDP; I am at my ends witts right now.. My 2005 mitsubishi outlander ac went from great air to warm air. I was told the problem was the evaporater so the mechanic changed it with a new one. Man what a difference the air was great again. . less than 2 months later it’s doing the same thing.. I just it back today and he said no leak was found but…. he put ink to check to see if theres a leak and told me to drive it around for some days. it was working great and less than 5 min. it’s blowing warm air. I shut it off and ran into a store to buy something. 10 min later I started it again and still it’s blowing warm air. I shut it again and 2 min later tried it again and it worked great. I’m home now writing this. I already took the car to an elecrtical earlier this week and they found no shorts anywhere. I’m hoping you might have a suggestion of what what might be the problem??

    1. Aline,

      Thanks for your question about your Outlander. The problem you’re describing does sound very frustrating, but it also sounds like you’re on the right track. It was a smart move to have your system checked for electrical shorts as electrical problems often cause intermittent issues like you’re having. You may also consider taking your car back to the mechanic who put the dye in your system to check for leaks, but our suspension is that isn’t your problem.

      Our best guess is that you’ve got a faulty pressure or temperature sensor somewhere in your system that when it fails is telling the system to shutdown to protect itself. Unfortunately, checking these sensors is something that only an experienced mechanic or a dealership will be able to do, so you may have to take your car to another shop.

      Thanks again for your question!
      -BD Auto pro

  34. I have a 2005 Buick Lesabre that the ac light comes on ,but the fans and the compressor does not come on. What should I check for this?

    1. Dale,

      Thanks for your question about your 2005 Buick LeSabre. The most common problem with an air condition system is a leak. If a leak has caused the pressure in your system to get too low, the system won’t allow the compressor to come on to protect itself. If the compressor doesn’t come on, the fans won’t come on either because the temperature sensors in your system won’t detect a rise in temperature. We would recommend starting by checking the low side pressure in your AC system. If that is too low, add Red Angel AC Stop leak (available here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) and then add refrigerant until your system is at the proper pressure.

      Thanks again for your question!
      -BD Auto Pro

  35. Hi there,
    I have a 2006 scion Xa, there’s seems to be a couple different issues going on with it. Sometimes the AC will stop blowing completely. Could be for days or even weeks. Out of nowhere it will turn on, then off again. It’s completely random. When it’s not turning on and off it will pretty much blow warm air. When the car is stopped or first turned on it will take a while for it to start blowing semi cool air. It will blow this “cool” air for a bit, but once the car has been driving for a while it reaches a certain speed, usually above 35, it will start blowing the warm air. Checked at home to see if there was any refrigerant and the gauge was dead center between blue and yellow.

    1. I Brown,

      Thanks for your question about your Scion Xa. Often times intermittent problems like this are due to bad pressure or temperature sensors if your system shutting the system down because it thinks a temperature or pressure is out of range so you may consider checking those sensors. Since you mentioned things to get semi-cool at certain times you the problem might also be that you’ve got a clogged component somewhere in your system. To check for clogs you will need a set of mechanics AC gauges to test the high side pressures around your system to figure out where the clog is.

      Thanks again for your question!
      -BD Auto Pro

  36. I have a 2012 altima and all of a sudden the air stopped blowing cold air and only blows hot air it has been checked to see if it needs r134 but it wont take any so i asume that it is full can you please tell me what is wrong with it. And the same thing just happen to my 2004 745li bmw on today please help

    1. Cynthia,

      Thanks for your question about your 2012 Altima. Usually, sudden failures in your air conditioning system are from large leaks due to damage to an AC line or the condenser. Sometimes compressors fail suddenly but usually they start working less and less over a few weeks. We would recommend checking the low and high side pressures in your air conditioning system to check to see if the problem is a low refrigerant level due to a leak, or a bad compressor. If the low side pressure is low, you need to add refrigerant. If the high side pressure is too low then your compressor is probably going bad.

      Thanks again for your question!
      -BD Auto Pro

  37. Two Weeks Agoish My Nephew And I Replaced My Radiator Which Cracked And Leaked Out. Everything Seemed Fine Then a/c Started Blowing Hot Air.Did We Do Something Wrong? We Did Not Undo Any A/C Lines,Etc.Its A 2005 Jeep Liberty With 200,000 Miles. I Have Replaced Almost Everything In The Last 3 Years. New A/C About A Year Ago.Any Ideas On What We Might Have Done Wrong?

    1. Jen,

      Thanks for your question about your Jeep Liberty. It could just be a coincidence that your air conditioning stopped working after replacing the radiator, but there are some air conditioning components near the radiator that could have been affected. First, make sure the electric fans are working properly and come on when you turn the air conditioning on. If those are working correctly, it could also be that the condenser or a line was bumped enough during the installation that it created a leak. You can check that by measuring the pressure in your system.

      If you find a leak in your air conditioning system, especially a small one like this, you can use Red Angel AC Stop Leak (availible here: https://gobdp.com/blog/diagnosing-electrical-problems/) to seal the leak, then refill your system with refrigerant and get back to normal.

      Thanks again for your question!
      -BD Auto Pro

  38. I have a 2000 Chevy calvalier, it was a gift from a friend due to no job or transportation.. The ac doesn’t working , a shade tree ( don’t have money to take to a shop) told me the compressor isn’t working/turning and I shouldn’t drive it because I will wear down the belt. Am I able to drive it Until I can save the money to get the repair done.

    1. Mary,

      Thanks for your question about your 2000 Cavalier. The only way continuing to drive your car with a broken air conditioning system would damage anything would be if the compressor was seized with the clutch engaged. If that was the case, you would hear a very loud squealing anytime the engine was running and the belt would break after a matter of minutes. Since you didn’t mention that, our guess is the system probably simply has a leak and it’s safe to drive the care with the air conditioning broken as the compressor isn’t engaged and the pulley on it is just acting like an idler pulley.

      Thanks again for your question!
      -BD Auto Pro

  39. We have a brand new BMW X3. We have found that after a 20-30 minute period while driving on the the highway the air conditioner starts to stop blowing cold air and gradually the air coming out of the vents warms up to a temperature that is just slightly cold but not adequate to keep the car cool, despite putting the system on “maximum” a/c. After stopping for a brief rest, the a/c worked fine again in the beginning but the same thing happened again. We have not noticed any problems while driving around town for shorter trips at lower speeds than when on the highway. We took the car into the dealership today and they couldn’t find anything wrong. Any ideas? Thank you.

    1. Jim,

      Thanks for your question about your BMW X3. If it is indeed brand new, honestly the best thing to do is to find a dealership that is willing to do a longer diagnostic on it as it should be something covered by your warranty. If you attempt to make any repairs yourself it could preclude warranty work in the future. The problem could be a bad sensor measuring an over pressure, over temperature or insufficient cooling of the condenser. The same problem could actually be due to your evaporator freezing up because the system is cooling too well.

      Thanks again for your question!
      -BD Auto Pro

    2. Same complaint I am also facing in my Hyundai Elantra 2013. It is working for my daily trip of 20Kms. When going for a long trip, after around 30-40Kms, stops cooling. I have stopped car without stopping engine to check whether the compressor is running or not, found it is working. I get in to the car and found AC cooling with in this few minutes of stopping the car. The same thing I have noticed many times. Now when ever I faced this, I just stopped car (even in signal it is happening) for few minutes, then again it is getting cooled. Just I have to release the accelerator for few minutes and AC starting cooling. What will be the defect? Refrigerant pressure is confirmed normal, there is no leak, compressor is working, but not cooling after highway running of around 40Kms. Waiting for a genuine answer. Mechanic was telling that compressor is weak, but I cannot believe that.

      1. Suresh-

        Thank you for asking about your Hyundai Elantra. Based on your description, it sounds like the A/C system is not getting the proper circulation of refrigerant, either from a weak compressor or some kind of restriction in the system. We recommend flushing the A/C system to get rid of any potential restriction in the system that would be affecting the circulation of refrigerant. If that does not do the trick, you may want to look into having the compressor replaced.

        Thank you!

        -BDP

  40. Hello,

    I have a 2005 Dodge Stratus STX 4 door.
    My AC is hit or miss.
    In the afternoon, the AC is working and blows cold air. In the evening it’s blowing Hot air.
    The next day in the morning, it will blow cold air all day while driving. I drive to work and it’s cold.
    I go to lunch and it’s cold. I drive home and it’s hot.

    The next day, hit or miss again.
    I can drive to the mall in the heat of the after noon and it blows cold the entire time be if full stop or 65 mph.
    On the way home from the mall, blows hot air at full stop or going 65 mph.

    When it works, it’s nice and cold.
    When it doesn’t work…nothing but hot / normal air.

    1. Samuel,

      Thanks for your question about your 2005 Dodge Stratus. Based on your description it doesn’t sound like your problem is on the mechanical side of your air conditioning system but rather an electrical problem either with your ventilation system or your air conditioning system. Electrical problems can be intermittent like your describing and would cause the sudden lack of cool air. It could be a bad sensor, a bad connection or even broken wire. Try tracing through the components in your system and shaking or gently pulling on the wires while the AC is on and seeing if you can simulate the problem you’re having. Once you do, you’ve identified to problem component and can replace it or the wiring.

      Thanks again for your question!
      -BD Auto Pro

  41. My 2007 VW Jetta doesn’t blow cold air and the refrigerant level is fine. We also noticed that the line was not cold nor showed condensation. What could be the problem?

    1. Sonya,

      Thanks for your question about your Jetta. If you’re not getting any cold air and you’re sure your system has the proper level of refrigerant then the problem could be that your compressor is broken and needs to be replaced or that your compressor simply isn’t engaging. You can try watching the center of the compressor pulley to see if it rotates when you turn the AC on. If it doesn’t, you may have an electrical problem like a bad signal wire or a faulty pressure or temperature switch.

      Thanks again for your question!
      -BD Auto Pro

  42. We have a 2010 dodge 2500 diesel truck. The a/c blows fine out of the vents for some time on 3,4, and max. Then the vents will slow the air from high to the air barely coming out. Then the air is still cool but the vents barely have any air coming out. The blower is still blowing but not forcing air through the vents. If you turn it on defrost there is no air coming out of that vent either. Occasionally I can get it to come out of the feet. If we stop the vehicle and kill the ignition and let it set for a little while it may blow through vents again and sometimes it may not.AC is fully charged with no leaks and air is cold but not coming out of the vents.

    What could this be?

    1. Kristi,

      It’s possible that you’ve got a problem with your ventilation system where the air blend door or vent control door are slowly moving after leaving the system on. This would cause the problem you’re having. If that is the case, you would probably need to replace one of those servos, but it would be a difficult problem to prove. Since it is so irregular, our guess would be that your evaporator is freezing over after use. This would make sense especially if you live in a warm climate. The most common causes of frozen evaporators are clogged cabin air filters or blocked AC condensate drains so you might try checking to see if you’ve got either of those problems.

      Thanks again for your question!
      -BD Auto Pro

  43. Hi I have a 2007 Dodge Caliber I am having problems with the Ac plz help.. The Ac dose not blow cold air I tryed everything the pipe line dose not get cold like it’s supposed to the only way I can make it blow cold air is if I use the water hose and wet the front of my car ???

    1. Sandra-

      Thank you for asking about your Dodge Caliber. Is the A/C blowing warm air or no air at all? If it is blowing warm air, the most likely cause would be that you have a refrigerant leak somewhere throughout the system. Since the air conditioning system in your car is mounted to a moving, vibrating vehicle that is exposed to the elements and road debris it is not unusual for hoses and lines to come lose or O-rings start to leak over time. We recommend using the Red Angel A/C Stop Leak & Conditioner, found here on our website: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  44. I have a 2003 Toyota 4 runner. It leaks antifreeze when the heat or defroster are on with the fan light indicating open. It does NOT leak when this light is lit or the AC is on or when no temperature controls are on. Any ideas? Radiator and upper and lower hoses were replaced. Window does not fog nor does it smell like antifreeze in car. Please help.

    1. Deyse-

      Thank you for asking about your Toyota 4Runner. Based on your description, you may be experiencing a heater core leak. We recommend using the BlueDevil Head Gasket Sealer http://store.gobdp.com/head-gasket-sealer-38386/. As long as the vehicle can maintain idle for a full 50 minutes, and you are not losing more than about a quart of water/coolant during that 50 minutes, you would be a great candidate for the product.

      Thank you!

      -BDP

  45. 2007 Ford Taurus. A/c not cooling. The air is blowing from the vents and it is cool air, not hot air, but its not blowing enough cold air to lower the temperature inside the car. I checked the refrigerant pressure with the engine on/ac on high and it falls into the “full” level. I can hear the a/c unit clicking on and off as the engine runs, so it is working, but still not enough to cool the car.

    1. Marian,

      Thanks for your question about your 2007 Ford Taurus. Great job in checking your low-side pressure and diagnosing the problem so far! If your AC is blowing strong enough, it’s possible that your air conditioning system is losing efficiency either due to a worn compressor or a clog in the system. To check for these problems you will need a set of mechanic’s AC gauges to check the high-side pressure ass well which will tell you if there is enough pressure rise across the compressor and if there is a pressure drop in the system somewhere besides the expansion valve. It may also be worth checking your ventilation system to make sure your air blend door is moving fully to the “cool” position.

      Thanks again for your question!
      -BD Auto Pro

  46. Great info! We have a 2008 Chevy Aveo, the blower is blowing but no cold air. Pressure is in the yellow area so we did not add to it. Everything looks good such as fuses. Any ideas what else might be at issue such as some sort of sensor?

    1. Richard-

      Thank you for asking about your Chevy Aveo. Have you taken the vehicle to an A/C specialist? Based on your description, it sounds like you may possibly have a defective compressor. If you have checked the refrigerant level and it is topped off to the proper level, moisture may have gotten into the system and frozen at the compressor. We recommend taking the vehicle to an A/C specialist to have them pull a vacuum and check for any leaks. If there are no leaks, a replacement compressor may be needed.

      Thank you!

      -BDP

  47. The AC on my 2001 Chevy Suburban is blowing hot air. I have other more urgent work that needs to be done on it first before I tackle the AC. I’m not mechanical and I’m recovering from shoulder surgery. Would you recommend I try Stop Leak and adding refrigerant and do you think this is something I can do myself? Thanks.

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