Jumping 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 even these are not solutions, they just slightly lessen the burn marks on the back of your legs from your hot leather seats.
When you’ve paid a premium for air conditioning in your car you’re ready to be comfortable when you hop in. Of course, it takes a few seconds for the air to get cool, but what if you’ve waited a minute or so and you’ve still got your car air conditioner blowing hot air in your face? Before you zip down to the dealership and pay for a vehicle inspection to figure out why your car’s air conditioner is not blowing cold air, try checking a few common easy to fix problems listed below.
“Why is my AC blowing hot air?” Check These Common Causes:
- Blocked condenser
- Broken cooling fans
- Broken condenser
- Low refrigerant due to a leak
- Electrical faults
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 refrigerant will still be hot when it travels through the expansion valve. If this is the case the hot refrigerant will only be cooled back down to ambient temperature so your AC won’t work. 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 drive into. A quick visual inspection of the condenser through your grill can help you tell if it’s blocked.
Like having a blocked condenser, having broken cooling fans can cause a lack of cooling at your condenser and could cause your car AC blowing hot air. The fans could actually be broken, like a burnt out motor, bad mount a chipped fan blade, or they could simply have an electrical problem like a blown fuse or burnt out relay.
Since 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 likely your best bet. If you cannot see the puncture, consider adding UV dye to your air conditioning system to identify the puncture point, or simply add Red Angel Air Conditioning Stop Leak to your air conditioning system to quickly and permanently seal the leak.
Similarly, you may have low refrigerant 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 Red Angel A/C Stop Leak to ensure your system is properly sealed and will hold your new refrigerant.
Lastly, you could have an electrical problem with your system. Like broken condenser fans and electrical fault can cause a normally working system to stop working simply due to a bad connection or faulty sensor. Electrical problems can include a faulty signal from your ventilation system caused by a broken wire or bad module, bad sensors tripping off your system or even a sensor in your vehicle’s motor that is causing the system to shut off inadvertently. For more information on tracking down electrical issues like this, read our article on diagnosing electrical problems.
A simple visual inspection and a can of Red Angel A/C Stop Leak is all you need to solve many of the common easy to fix problems with your air conditioning system! Stop by one of our partnering auto parts stores today to pick up a can of Red Angel A/C Stop Leak & Conditioner today!
- AutoZone
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- Bennett Auto Supply
- CarQuest Auto Parts
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- Bumper to Bumper Auto Parts Specialists
- S&E Quick Lube Distributor
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car_ac_blowing_hot_air.jpg – By dnberty – Licensed by Getty Images – Original Link
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???
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.
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.
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
It is very possible that you simply could just be low on freon also. I’ve been working on A/C for 20 yrs now but even if it is a little low. You need to have it evacuated and the slow leak found and fixed. Cause little leaks can sometimes turn into large problems down the road. Good luck stay cool.
my ac in my 2004 chevy silverado will blow cold for about an hour then go hot. is what you are talking about? compressor good and has freon….
Patrick-
Thank you for asking about your Chevy Silverado. Based on your description, it is possible that you are experiencing a slow Freon leak. We recommend evacuating the system and using the Red Angel A/C Stop Leak (https://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to stop the loss of refrigerant and then topping the system off with the proper amount of R-134a.
Thank you!
-BDP
You probably just need freon.
My car ac runs cold for app a half hour. Then blows warm air. If I stop for 45min or so. It will blow cold again.. what can I do to repair.
Rick-
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 A/C 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).
If it turns out that the refrigerant level is full then you may want to have an A/C specialist take a look at the vehicle for proper diagnosis.
Thank you!
-BDP
Rick, that’s what my Mazda Tribute does now.
Hello, I got my AC checked out due to blowing hot air and two auto repair shops told me the ac compressor was bad. I got a new ac compressor and got it replaced yesterday. It was blowing super cold air and then less than 24 hours later I get in the car and it’s blowing out warm air. Not as hot as before but definitely not super cold like it was yesterday when the shop replaced the ac compressor. They also put 2 cans of freon and compressor oil in there. Could this be a leak issue?
Shawn-
Based on your description, it does sound like you are experiencing a slight refrigerant leak. It’s possible the shop didn’t detect this because of the issue with the compressor, and the system seemingly working fine after replacement and topping off with refrigerant. We recommend using the Red Angel A/C Refrigerant Stop Leak to help stop your leak and return the A/C to normal functionality.
Thank you!
-BDP
When my car is idling I cut the AC on my car stalls it’s like when the compressor kick on its then the compressor off but every time it’s it stall my motor and it’s starts blowing hot heat do u think my compressor bad
Jammie-
Based on your description, it does sound like you have the symptoms of a failing compressor. Especially, if this only happens when you are trying to put the A/C on and the compressor is trying to engage. A replacement compressor should solve the issue.
Thank you!
-BDP
Rick, did you ever figure out what is the problem? My car does the same.
my 2016 Hyundai Elantra cold air has stopped working all of a sudden now blows nothing but cold air. I’ve noticed the compressor is not disengaging. But is still blowing hot air. Do you think it’s a compressor issue or something else.
Brandon-
Thank you for asking about your Hyundai Elantra. Have you tried measuring the refrigerant? It’s possible that the compressor is having to work harder than usual due to low refrigerant levels. It would be difficult to say where the leak is coming from, however, you could add a uv dye to try to pinpoint the source of the leak.
Thank you!
-BDP
I have a 2007 Buick rendezvous and I charged my ac and now it’s blowing hot air worse than it was before. The Freon valve says the Freon it’ll filled in my car. I’m a female please help
Samantha-
Thank you for asking about your Buick Rendezvous. If the system is full with refrigerant, and there doesn’t seem to be any leaks, the problem could be with one or more of the components of the A/C system. If you can hear the compressor engaging and the fans kicking on, the problem could be with the condenser. Also, an electrical problem would keep the A/C from blowing cold air. We recommend bringing the vehicle to an A/C specialist for diagnosis.
Thank you!
-BDP
Every thing was checked added freon,still blows hot air,cannot find the problem.
Joe-
Was the refrigerant level relatively low? Based on your description, it sounds like you may be experiencing a refrigerant leak. We recommend using the Red Angel A/C Stop Leak & Conditioner http://store.gobdp.com/a-c-stop-leak-aerosol-00222/ to get the system back to normal operation. Feel free to contact our technical support line at 888-8663-0426 with any other questions.
Thank you!
-BDP
Hi there,
I would like to ask you a question about my car had a problem with the hot air blow. I don’t really know what wrong with it?
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
LEXFORD I have 2008 Nissan Sentra car the A/C not cooling the fan work but get warm air from a/c does stop leak would made it blow cool air.
Thank you
Lexfo-
Thank you for asking about your Nissan Sentra. It’s possible you are low on refrigerant. Based on your description, we recommend using the Red Angel A/C Stop Leak (https://store.gobdp.com/a-c-stop-leak-aerosol-00222/). After use, top the system off with refrigerant and the A/C should be back to blowing cool air.
Thank you!
-BDP
I have a 2009 nissan rogue and the ac stop blowing cold after 40mph
What could be?
Margarita-
Thank you for asking about your Nissan Rogue. Based on your description, it sounds like you my be experiencing a refrigerant leak. We recommend using Red Angel A/C Stop Leak (http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to help stop the loss of refrigerant and get the system back to normal functionality.
Thank you!
-BDP
Unlike everybody else’s problems here. My vehicle blows great when accelerating. When I stop, slow down, or idle I loose my ac and it blows muggy warm air. While driving at constant speeds it goes back and forth between hot and cold. My ac holds pressure and I am not low on Freon. I think I might have a wire that cuts in and out. What do you guys think?
Isaac-
The most common explanation for why your car’s a/c will blow cold when accelerating, but warm when you stop or idle the vehicle, is that the system is low on refrigerant. Since you’ve mentioned that the system is not low on refrigerant, an electrical issue could be the cause. We’d recommend getting a set of gauges and measuring the PSI’s from the high side and low side. These PSI measurements should be able to point you in the right direction as to what’s causing the problem.
Thank you!
-BDP
My car was blowing hot air and I replaced a actuator sensor then it blowed cold air then a couple of days later i turned it on and it blew hot air again I tried to put free on and it didn’t work still blew hot air what could it be I need help please ????
Aubrianna,
Thanks for your question about your car blowing hot air. Our first recommendation would be to check the part that you just replaced to see if it has gone bad again. It’s possible you installed a bad part, or there is a deeper problem that is causing that part to go bad. Also, you mentioned adding refrigerant, if you had a low refrigerant level a leak could be your problem. If you had a low refrigerant level, add BlueDevil A/C Stop Leak to seal the leak and keep things cool.
Thanks again for your question!
-BD Auto Pro
I have a 2005 chevytrailblazer & i bypassed the compressor my pressure switch is good i also charged it n it still blows warm air. What could the problem be?
It’s the Actuator that’s all it is and it’s not expensive to get you an actuator and fix your vehicle you’ll get cold air right after you do that
My serpentine belt broke on my 2012 chrystler 200 3.6 lit and when it broke it ripped out I plug and was only blowing hot air.
Took to shop and they found problem. Wished I would have looked forst…lol
Hey I have a 12’ Chevy cruise … my Freon is full my compressor is working properly. I had a small pin hole leak in my condenser but I put stop leak and haven’t had any problems until now …. While I’m driving the ac blows cold but if I stop at a light or for a few minutes any where it begins to blow hot rather quickly … what could be causing this to happen
Tammy-
Thank you for asking about your Chevy Cruise. Based on your description, it’s possible the system is just a bit low on refrigerant. This would be the best explanation for why the system would be blowing cold air while you drive and not when you come to a stop. We recommend measuring the refrigerant level with a gauge and making sure the system is topped off to the proper level. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
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
Michelle-
Thank you for asking about your Hyundai Santa Fe. Based on your description, 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/ . Make sure the system is evacuated or partially depleted prior to adding the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
I have a crown vic and I have heat on all settings
Mike-
Thank you for asking about your Ford Crown Victoria. Have you noticed a loss of refrigerant? Based on your description, we recommend using the Red Angel A/C Stop Leak to stop the loss of refrigerant and get the A/C back to blowing cold. Feel free to contact our technical support line at 888-863-0426 with any other questions.
Thank you!
-BDP
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
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
It’s your compressor
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?)
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
I hot wire my a/c compressor to make it to come on cause it was not turn . But I add freon in it and it is in the green still blow hot air what do I do
James,
Thanks for your question about your air conditioning. The problem could be that you’re hotwiring the compressor and there are other electronics in the system that aren’t turning on causing the system not work properly. Our suggestion would be to start by repairing the problem with the wire to the compressor, or fuse or whatever is causing that problem and see if that gets things back to normal.
Thanks again for your question!
-BD Auto Pro
Just got a new ac gluch relay changed.
Ted-
Feel free to contact us at 888-863-0426 with any questions.
Thank you!
-BDP
I have Corolla Toyota 2010 AC working sometime and sometime not
Ahmaf-
Thank you for asking about your Toyota Corolla. Based on your description, the system may be low on refrigerant, which would indicate a leak. We recommend using the Red Angel A/C Refrigerant Stop Leak to help stop the loss of refrigerant and return the A/C to normal functionality.
Thank you!
-BDP
On my 2011 Hyundai Elantra the AC only works sometimes when I start the car. When it is working and the engine is running it stays on and is consistently cold. When I turn the engine off and start the car again it will sometimes work and sometimes just blow warm air. When it is not cooling when I start the engine I can feel air blowing thru the vent, it pauses then drops down to the floor vent and the back up to the cabin vent with warm air.
Susan,
Thanks for your question about your Hyundai Elantra. Based on the random change of ventilation, it sounds like your problem might be with the ventilation system rather than the air conditioning system. If you’ve got automatic climate control, you might try resetting the module, or checking the wiring to the servo control motors that control the ventilation doors.
Thanks again for your question!
-BD Auto Pro
My a/c has been blowing hot air for three day, i replaced the thermostate, and hoses and cleaned out the entire system. But still hot/room temp air is piuring out.
Cameron-
Based on your description, it sounds like you may be experiencing a refrigerant leak, causing the system to only blow hot air. We recommend using the Red Angel A/C Stop Leak (http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) to help stop the loss of refrigerant and get the system back to normal functionality.
Thank you!
-BDP
I have Chevorlet cruz, and when i wash my car, after that car ac doesn’t work and blows hot air. Any specific reason behind that?
Saurav-
Thank you for asking about your Chevrolet Cruze. Based on your description, is sounds like you are getting low on refrigerant. We recommend using the Red Angel A/C Stop Leak (https://gobdp.com/product/ac-refrigerant-stop-leak/) to help stop the loss of refrigerant and return the A/C to normal functionality. You will top the system off with refrigerant after running the vehicle for 15-20 minutes with the Red Angel in.
Thank you!
-BDP
My AC is not functioning well,when am in a traffic, my temperature goes up and car over heat,but when not in traffic it blows well.
Tolulope-
Is the vehicle overheating in traffic only when the A/C is on or does it overheat when sitting in traffic regardless? If only when the A/C is on, it could be that the a/c compressor is failing and putting an increased load on the engine, causing it to work harder and to overheat. Replacing the compressor should solve the issue.
Thank you!
-BDP
My 2005 suburban stopped blowing cold air. Took it to my mechanic and he said I have burnt wires leading to control panel in the dash. Can this be bypassed to make the AC work again. The compressor and fan blower are ok and it’s full of freon .
Blend door actuator.
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??
Their may be an electrical issue not allowing the AC & Heat switch back and forth. You will most likely need to have this diagnosed at a local dealership or trusted mechanic.
-BDP
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.
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
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
On a ford more than likely its the vacuum controlled dampner in the heater core housing.
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
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
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???
Gamond-
It sounds like you have a refrigerant leak and not a problem with your compressor. You can try adding the Red Angel A/C Stop Leak to stop any refrigerant leak you may have. After adding the product you will want to fully recharge the A/C system with the proper amount of Freon. The Red Angel can be seen and purchased here: http://store.gobdp.com/a-c-stop-leak-aerosol-00222/
-BDP
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?
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
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?
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
I have a 1995 Saturn.sl2and we add freon yesterday and afterward it spilled out antifreeze and the Ac is still not cooling of it hot air wat can it be
Sara-
Thank you for asking about your Saturn SL2. Based on your description, it is difficult to say where the refrigerant would have been lost from. Unfortunately, it sounds like you may be losing it a little too quickly for the Red Angel A/C Stop Leak to be affective. We recommend taking the vehicle to a A/C specialist for a diagnosis as to where the leak is coming from and a possible part replacement.
Thank you!
-BDP
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?
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.
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?
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
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?
Yuri-
It sounds like you may need to replace the temperature actuator.
Thank You!
-BDP
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
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
I have a 2007 Mazda 3. The fan is working but when I turn on the AC there is not a difference in temperature (hot air) and when the car is stopped or idling the it makes a high pitch loud buzzing noise. However, the buzzing stops when I turn off the AC button. If I am driving with the AC on it doesn’t make the noise and there is an extremely subtle temperature drop coming from the fan, but as soon as I slow down or idle the buzzing starts again. What could the problem be? Thanks
Corey,
Thanks for your question about your 2007 Mazda 3. The answer depends on where the buzzing noise is coming from. If it is coming from under your dash or near the blower fan then our guess is you have a failing blend door motor that is making the noise. If the sound is from under the hood then our guess would be that the magnetic clutch on your AC compressor is failing. To check for this you can try popping your hood while your engine is idling and having a friend turn the AC on while you watch the compressor. If the noise is coming from the compressor or the center part of the compressor pulley doesn’ turn when the AC is switched on, then this could be your problem.
Thanks again for your question!
-BD Auto Pro
Hi, iam driving camry 2019, the AC light is on but the fan and compressor turn off and blow a hot air (when the car stop only) and this happen when temp out side rising and when car moving its turn on again, your advise please
By the way that happen after a few minutes of stopping not directly
Thank you
Mahmoud-
Thank you for asking about your Toyota Camry. Does the compressor kick back on when you start moving again? Does it seem to be blowing cold air when you’re moving? If so, it may be indicating that you are low on refrigerant. Try recharging the system and filling the refrigerant up to the proper level.
Thank you!
-BDP
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.
Vedat-
It sounds like your compressor may not be kicking on properly. You may want to have it checked by an A/C specialist.
Thank You,
BDP
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
Savith-
We recommend checking the Freon levels. It is possible that you are a little low on refrigerant.
-BDP
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.
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
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.
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?
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
The clicking noise could indicate that it has a faulty temperature blend door, just my two cents
I have a 2013 Nissan Sentra. The a/c will be blowing cold then the cold feels like just the fan is blowing. If I turn it off then turn it back on, it blows cold again. It’s getting worse during the last few weeks. No problem with the actual fan blowing; just have to continue toggling between a/c and fan to make it blow cold. Any idea?
Vicki-
Thank you for asking about your Nissan Sentra. Based on your description, you may be in the beginning stages of a refrigerant leak. If that is the case, we recommend using the Red Angel A/C Refrigerant Stop Leak. This would help stop the loss of refrigerant and return the A/C to blowing out continuous cold air.
Thank you!
-BDP
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..
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
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.
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
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?
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
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.
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
I am in Nigeria, do you have any distributors here to buy from? Kindly refer me.
Kelvin-
Yes, we do have distribution in Nigeria. They will be contacting you via email in the near future.
-BDP
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??
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
I have a Toyota Corolla 2013 model, the compressor working no trasing of leakages including from the condenser, if gas is refiled it get cold normal but goes off after 2 days, motor is working too, what could be the cause, am from Nigeria, many thanks
Mr. Kadri-
Thank you for asking about your Toyota Corolla. Based on your description, it seems as though you are experiencing a slight refrigerant leak somewhere throughout the system. We’d recommend using the Red Angel A/C Refrigerant Stop Leak to help stop the loss of refrigerant and return the A/C to normal functionality.
Thank you!
-BDP
2018 impala Lt AC not blowing cold air. Fans don’t turn on and clutch is not engaging
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
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
How do fix the problem
Sal-
Feel free to contact our technical support line at 888-863-0426 with any questions.
Thank you!
-BDP
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.
Srini-
It is possible that you are simply low on refrigerant/Freon. The fact that the compressor still kicks on is an indication that it is still functioning but may not have enough Freon in the system to blow cool air from the vents.
We recommend adding the Red Angel A/C Stop Leak (http://store.gobdp.com/a-c-stop-leak-aerosol-00222/) and then recharging your A/C system with the proper amount of R-134a.
Thank You!
-BDP
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?
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
my car a/c is blowing just hot air, we checked the freeon it’s full. IS IT MY COMPRESSOR.
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
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
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
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?
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://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
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.
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
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
Gabby-
The most likely cause it the blend door actuator. Having the actuator replaced should solve this problem.
Thank You!
-BDP
Hi, In the Toyota Corolla, is the Blend door actuator the same as the servo?
Yes, it is referred to as the blend door servo actuator.
-BDP
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?
Gabby-
Yes, you may want to have a gauge put on it as the system can act up if it is overfilled.
-BDP
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?
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
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?
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