Car Ac Blowing Warm Air Intermittently

The compressor is not running when it blows warm. Not sure what to check, or if I could be low on Refrigerant or what??. Air from vents is same as ambient plus same humidity 3. And if I'm not moving then sometimes the Rpm's will rev up to like 1900 while idling, and the air is still blowing hot, not even remotely cool. A faulty automotive air conditioner can be one of the more difficult issues to diagnose and repair. It used to work great. While I wait on advice regarding my hard starting problem something new just developed today. you may also need a new drier, depending on how contaminated the system got from running with the leak. Extreme heating conditions can make you feel dehydrated and can cause illness. It's that time of year again. I turned off AC. This whole summer, the A/C is intermittently blowing warm air for anywhere from 5-30 minutes. Is your AC not working? If your central air conditioner is not cooling right, repair it with these expert DIY air conditioning repair techniques. Your AC cools air by blowing it over the evaporator coil. Another way to determine why you are faced with a problem of car air conditioner blowing hot air is to see when the unit blows warm air. When I cut the unit off for a few minutes and back on most of the time it works again blowing cold air. We strongly recommend the use of an AC manifold gauge set when checking a system. Owners of 2014 Chevrolet Silverados are hot about AC problems. The cooling system and actuators will need to be properly inspected to find the source of the issue. Took it to the Honda dealership and he said the AC Compressor and Dryer needs to be replaced which cost me $1500. Whenever it gets hot out (80+ degress) I like to turn on my AC. Last year in the summer it went out on a drive out of town where there was just hot air coming out of the events, and just last week it did it twice. My mechanic diagnosed it as the gap had worn to far on my a/c compressor clutch. Great Variety of Vintage Car Parts and Accessories Browse a lot of Universal 50 available for sale online. When the hissing stopped, air was cold. When the car gets really hot the high speed kicks in ( I have seen it). I found out that the AC Compressor 10 A fuse will immediately pop when I turn on the AC, but air still blows out the vents. You have two hoses on your AC compressor, one big and one small, it is the small one that may have a sight glass on it. Heater only blows hot air intermittently. AC intermittently blowing warm air on hot days. seems I've got an issue with my AC. All the belts are new and appropriately tight. "ON" means the fan is always blowing air through your vents, even when your system isn't working to cool the air it blows. I took it to a local shop and they filled my Freon, which was pretty low and the mechanic hit the clutch with a hammer and it engaged again. I also noticed that the climate sensor on the dash that usually "clicks" when I rotate the temperature wheel is not. Frozen units cause other problems too, which are often called in as individual problems before they notice the unit is not blowing cool air. Since according to the dealer we have had trouble with our fuel relay I am wondering if this A/C issue might be related to a relay or fuse. Sometimes the AC works fine the entire journey and other times the AC seems to just switch off by itself. The ac was blowing well on all air speeds. But the 10% of the time that it doesn't work is miserable. When working the air is cold so > I'm not sure how it could be a low refrigerant cause. I can usually feel a tiny, tiny bit of cool air if I stick my hand over the vents, but nothing really blowing out. Said it sounded electrical by the symptoms. We took it back to the shop and they noted that the compressor was shutting off for some reason. My mechanic diagnosed it as the gap had worn to far on my a/c compressor clutch. It may cycle the AC on and off or poorly due to slippage to produce less cold air but not hot. They replaced the compressor again, but we are still experiencing the same problem. They've checked the obvious stuff like leaks or low coolant. Truth is, there are a ton of different variables that lead to warm air blowing out of your air conditioner. In other words, one day your car's A/C is blowing cold air, the next day it's warm air. Hello, I have a 2006 GMC Sierra 1500 5. If O–rings and/or seals for R1 2 air conditioning sys– tems are used by mistake in the connections of an R 134a air conditioning system, the O–ring and seals will foam and swell resulting in leakage of refrigerant. And, while that can help improve air quality if you have a whole-home air cleaner installed, it could also be the reason why you feel warm air (or at least air that isn't cooled) blowing through your vents. Could this be due to low freon?. When it goes off like this. Anyone have ideas of how I can determine what is wrong?. Hi Gents, Got a Honda Civic in the workshop with an intermittent AC/HVAC fault. An hour later got back in the car and it was hot again. If you or your kids accidentally set it to warm, the unit will start blowing warm air to maintain the temperature instead of cool air. Now it doesn't come on at all the blower and ac. Vents were very hot so knew it would take a little bit. While there are many, many reasons your air conditioner is blowing hot air, we'll run through the most common causes that you can fix or diagnose on your own. Last week I had my AC drained and refilled because it wasn't cooling well. RE: AC problems IP: Logged Message: Just bought an 04 Dakota QC 4. A ride can be even more uncomfortable if you are stuck in traffic. About three weeks ago I noticed my AC blowing stale/hot air intermittently with the A/C turned on and activated (a/c button depressed, and lit up). It doesn't seem like there's a smooth transition between warm air to cool air when it's at 19C, the air is still very warm, and when it's 18C or lower, it's cold air. The weather cooled off again so I didn't use the AC for a few weeks. The 2016 Hyundai Tucson has 28 problems reported for a/c intermittently blows warm air. We took it back to the shop and they noted that the compressor was shutting off for some reason. We strongly recommend the use of an AC manifold gauge set when checking a system. If it's not dripping at all then it might be that the condenser is freezing up. Next time you turn it on, when it starts blowing warm air check and see if the compressor is turning. Fortunately, there are things that you can do if your air conditioner is not blowing cold air. They have had two different people look at it and they have tried replacing the motor and the fan motor and the transistor and it is still doing this. why does ac blow warm air? why does ac blow warm air? Asked in Heater Cores and Blower Fans, Car Heaters What intermittently causes the heater to abruptly blow cold air at the same time the. I live in Florida and it's above 90 degrees most day. Anytime I have looked under the hood the compressor doesn't look like it's spinning and the A/C is blowing hot. No trouble codes either. It started with intermittent hissing coming from the dash. Cold Air Blows Intermittently So you went for a road trip or a long drive, and after 30 minutes of driving realized that your AC suddenly stopped working or switched to blowing warm air. The heater not working in some cases may be related to the overheating problem you are also having. If the car was low on coolant, and the heater is blowing cold air, this sounds like a possible water pump failure. This may be your problem. We have been having 100 degree weather. It will just start blowing warm air for about minutes then it will start blowing cold again. My AC blows cold air when outside temp is below low 80's, but ac's functions diminishes as outside temp rises, and ac blows warm air as outside temp approaches 100 deg F, when I need AC the most. The Versa sedan is the least expensive new car sold in America. If it's hot in a situation of car air conditioner blowing hot air , then it's an engine problem. It didn't blow hot air, it just wasn't blowing cold. Car air conditioner working intermittently? For the past YEAR my cars a/c works intermittently, I have any theories: when it's hot, the ac blows out room temp air and 10-20min later ac will kick on, when it's cold out ac works fine, when it's not working and I hit a bump in the road it works again. They have had two different people look at it and they have tried replacing the motor and the fan motor and the transistor and it is still doing this. Well here goes the story. I am now having air conditioning/heater issues. Found a fitting on the vacuum line that snaps onto the nipple of the plastic air reservoir tank (under the right front fender) has an o-ring that had hardened and wouldn't seat and leaking air, so I cut the fitting off, put 6 inch length of rubber hose over the plastic. If your AC is blowing hot air, the thermostat may have been accidentally set to "heat. AC blows out of top vents intermittently 1 Answer My account blows out of the vents intermittently. My car developed new problem with the AC. Well here goes the story. ) During warm weather : The AC would NOT come on very randomly, say once a month, or two months. On three different occasions, AC blows hot air out of the two driver side ducts. I shut the car off, tried turning the compressor by hand, and there was some resistance, as there should be, but it turned. Start with the fan speed turned to its highest setting. Every 5 min it blows hot air. I assumed that it need to be re-gassed and got this done by a local garage. My 2007 CRV has been having some issues with its AC. Compressor itself works fine when manually triggered. But its not heater core problem. Have an expert inspect your ducts along with the furnace. If I make it 82 degrees, it will blow cold air it seems. This is the reason that it takes a while for heaters to start blowing warm air. The AC only blows cold when turned to the last two clicks on the temp knob, its mixed warm air above that. My S550 PP GT has had intermittent AC cooling issues since I've owned it. We had a pretty warm day and I decided to try out the air conditioning. I have an 02 LS V6. My AC compressor seems to be engaged when issue is present though. I checked the refrigerant pressure with the engine on/ac on high and it falls into the "full" level. I have a Ford Taurus and the heater, of late, is working intermittently. I was cruising at about 65 MPH, Outside temp is 105. I took it to a local shop and they filled my Freon, which was pretty low and the mechanic hit the clutch with a hammer and it engaged again. Also, when it starts blowing hot, stopping the compressor by shutting off the AC button will allow the condensor to warm up, melting the ice. This time we get to share some good news. When the A/C starts blowing warm, turn the ac OFF then ON, observe the VOLT reading. In other words, one day your car's A/C is blowing cold air, the next day it's warm air. This year switching to the defrost setting has not yielded the same results. Sometimes the AC works fine the entire journey and other times the AC seems to just switch off by itself. Also you are going to need to check the drain or empty the drain in order to help. The reading for this sensor sensor 05 for my 1998 C280 was 159 with the car running for 10 min and 158 without starting the car in the morning after a night with outside temp 80. Checked the AC fuse, and its okay. My 2009 xc90 has been having AC issues for about 6 months. I checked the refrigerant pressure with the engine on/ac on high and it falls into the "full" level. AC blows cold, then hot, then cold Blazer Car Forums on but will blow cold air for 5 seconds then back to hot for the same. "ON" means the fan is always blowing air through your vents, even when your system isn't working to cool the air it blows. The true most common problem among AC units is to blow warm air; however, the cause of that is often a frozen unit. What could it be. I say it switches off because for one it blows hot/outside temp air and for another the different smell of fan blow air as opposed air-conditioned air smell. The fans on my car have two speeds. My AC worked finetook maybe 1-2 minutes to feel very cool and a couple of more and air was blowing cold. I just ordered a dash cam and will be installing that as soon as it arrives. I also noticed that the climate sensor on the dash that usually "clicks" when I rotate the temperature wheel is not. The AC light is not flashing. The passenger side still blows cold. They replaced the compressor again, but we are still experiencing the same problem. Well once we reconnected the battery and had the AC recharged it now only blows out HOT air. Once the car gets up to normal temperature, it begins to blow hot air out the vents. If your air conditioner is blowing warm air, or just not working properly, it is best to schedule a service ASAP to maximize your comfort. Sounds like a faulty air mix actuator to me. But, when it isn't working properly, a sunny, summer drive to the store can be brutal. During the hot summer days, Air Conditioners are mostly used to serve as a relieving agent, getting a cool air for a fresh environment. During warm weather : The AC would NOT come on very randomly, say once a month, or two months. If we turned the AC off for a few minutes it would again blow ice cubes out of the vents for a few minutes. It would be helpful if you could find a pattern to when this occurs. Presenting Universal 50 available to buy today online!. There are many other reasons a car’s A/C may be blowing out warm air though. I lived in Texas and my AC started intermittently not working in October of 2008. I brought car to two VW dealerships to have their service department diagnose the problem. I have Freon in the system, Brent (sandman) did a compression test and it's compressing and has freon. The consumer stated the brake was spongy, the abs light illuminated and the ac worked erratically, depending on the blower speed and would sometimes quit blowing cold air and would start to blow warm air. In many of these articles we focused on some of the worst AC problems an old car can have. This is a discussion on AC blowing warn air intermittently within the Mustang GT350 General Discussions forums, part of the Mustang GT350 Forum category; I was driving home last week and the AC has started to blow warm air sometimes then it gets cold again. This is because once the furnace gets too hot, the high temperature triggers the limit switch that turns off the burners but keep the blowers running to cool the furnace before shutting down. Compressor itself works fine when manually triggered. I have to keep the A/C setting to LO to get cold air. No particular rhythm to it. When the car is idle, I feel warm air coming from both the driver and. Fixing intermittent cold air on a central air conditioner is possible armed with the right knowledge and the right tools. If it jumps slightly going from ON to OFF and dips slightly going from OFF to ON this means the A/C clutch is being powered. Lately the info center warns me of ice on road. I placed the control on the vent setting, set the temp to 65 and it was like the heater was on. System evacuated and recharged, still exactly the same. Now it doesn't come on at all the blower and ac. My 2013 flex intermittently blows warm especially when accelerating. AC blowing warn air intermittently. I googled "AC problems 2014 silverado" and got lots of hits. This is a discussion on AC blowing warn air intermittently within the Mustang GT350 General Discussions forums, part of the Mustang GT350 Forum category; I was driving home last week and the AC has started to blow warm air sometimes then it gets cold again. When the car is idle, I feel warm air coming from both the driver and. The odd thing is, sometimes it works perfectly, so that rules out a lot of possibilities. Toyota Echo 2002-air conditioner blows cold intermittently Asked in Air Conditioning and Coolant Why your car air but if your talking about the part thats stays outside it blows warm air. This was the exact problem which i faced in my Skoda. And, when it senses any issue, AC is the first thing to get shut-off. seems I've got an issue with my AC. I have Nissan Altima GXE 2000. Sometimes when we have the AC on the vents start blowing warm or hot air instead of cold air. Sometimes, car air conditioner blowing hot air instead of cold air. The car AC system isn't particularly complicated, but there are several ways that it can fail. HVAC was set to SYNC at 66-68F, had cool air coming out the front, but warm air (probably 100F or so) coming out the rear which was causing passengers in the rear to overheat. When I drive off, it starts cooling. About a month ago, my A/C suddenly went from blowing cold air to hot air, accompanied by a burning smell. Nothing seems to work except letting the car sit for about an hour. Hi Gents, Got a Honda Civic in the workshop with an intermittent AC/HVAC fault. It'll quickly shoot up to 80+ in the house. I thought that I had not turned on the Ac. Car air conditioner working intermittently? For the past YEAR my cars a/c works intermittently, I have any theories: when it's hot, the ac blows out room temp air and 10-20min later ac will kick on, when it's cold out ac works fine, when it's not working and I hit a bump in the road it works again. Or worse yet, you come out to start the car one day, turn on the AC and it's blowing barely cold air when it was fine just yesterday. The fans on my car have two speeds. (but then sometimes it'll be good for a few days) When it does blow cold air, it's really cold! I've changed the compressor, thermistor, and receiver drier. It would be helpful if you could find a pattern to when this occurs. They have had two different people look at it and they have tried replacing the motor and the fan motor and the transistor and it is still doing this. I have taken my car to the dealership for repair three times while the car was still under warranty and once just after the warranty. Owners of 2014 Chevrolet Silverados are hot about AC problems. my civic does the same thing as you have described. if so, you'll need a new condenser. SC430 - 2nd Gen (2001-2010) - AC Blows Hot then cold then hot - I have a 04 430. I have put guages on it and the system is full, but I have noticed that the low side is at 50 and high side is at 180. (This is for if your car blows cold air for about 10 minutes after you start it and then starts to blow hot air. On long drives after a few hours driving ( sometimes less) the blower is clearly blowing loudly audible underneath the right side near glove box, Fan is on full, but no cold air is coming thru the vents except for a very small dispersion of air. During the hot summer days, Air Conditioners are mostly used to serve as a relieving agent, getting a cool air for a fresh environment. Does that mean it's a thermostat vs an AC issue? My wife. My mechanic diagnosed it as the gap had worn to far on my a/c compressor clutch. This whole summer, the A/C is intermittently blowing warm air for anywhere from 5-30 minutes. I will never go back to Ford again. All the belts are new and appropriately tight. Your air conditioning system pulls air in from the atmosphere or recirculates the air in your car’s cabin. I shut the car off, tried turning the compressor by hand, and there was some resistance, as there should be, but it turned. About three weeks ago I noticed my AC blowing stale/hot air intermittently with the A/C turned on and activated (a/c button depressed, and lit up). Unable to determine the ac pressures since the compressor doesn't engage. I have Freon in the system, Brent (sandman) did a compression test and it's compressing and has freon. My issue was the compressor clutch not engaging. I bought an BLEND DOOR ACTUATOR to replace the one that controls this function, however even the new actuator will not function when the wires are connected. There is two valves sold as a unit, about $170. Sometimes it is not routing the air through the air conditioner and is just giving you outside air. I'll drive about 10 minutes, turn the heat on, and it will blow hot hair. If I make it 82 degrees, it will blow cold air it seems. SC430 - 2nd Gen (2001-2010) - AC Blows Hot then cold then hot - I have a 04 430. Sometimes when I turn the AC it will blow out cold air and sometimes will not. I lived in Texas and my AC started intermittently not working in October of 2008. I have had it recharged and hoses replaced. A few weeks after that the ac would intermittently start blowing warm air. However, if the coil gets too cold, the condensation on it will freeze, turning the coil into a big block of ice. The AC will sometimes come back on after the engine has been off a while, but sometimes it won't come back until the next morning. It's off and on sometimes it will blow cool than back to hot. The AC only blows cold when turned to the last two clicks on the temp knob, its mixed warm air above that. AC Unit blowing cold air intermittently The problem with my car is that the AC unit seems to work half the time. When I drive off, it starts cooling. Then the problem started, the blower stopped working and no ac. Fixing car air conditioning that dies after a few minutes on hot days How to Diagnose and Adjust an A/C Compressor Clutch in Car Truck - Blows Cold Then Warm A/C Clutch Intermittently Does. Stuck & Blend Air Door. but when it sweats and is cold to touch, it blows cold a/c. DETAILS: - Make/Model: Honda/Civic - Engine: 1. Sometimes the AC works fine the entire journey and other times the AC seems to just switch off by itself. The proper amount of refrigerant in the system is very critical to A/C operation. I have found a wealth of info so far, and decided to join. The system is still blowing air (albeit not cold). If you notice that it initially vents out cold air, but over the drive goes to warmer air, then the problem is likely a frozen expansion pipe. LX470 and Land Cruiser air conditioning blows warm air The 1997-2007 Toyota Land Cruiser and Lexus LX470 both suffer from a common air conditioning failure – a leak from the rear A/C liquid line just behind the passenger’s front tire. it might be noteworthy to add that. It had 55K miles on it and AC started blowing hot air. How to Fix Intermittent A/C in a Volvo (P1/All) As we approach the summer months, air conditioner use becomes a daily ritual; discovering that the AC functions intermittently could be devastating. It isn't like the old systems. Air condition only blows warm air. Since according to the dealer we have had trouble with our fuel relay I am wondering if this A/C issue might be related to a relay or fuse. Last summer, my AC went warm. Chrysler Town and Country blows cold air, Chrysler Town and Country heater blows warm air, or. I have a 2004 Z71 with dual climate control. The consumer stated the brake fluid was very low. A sticking expansion valve will cause the symptoms you are describing. The compressor is not running when it blows warm. Some models of air conditioners will include a pressure control in order to avoid damaging the condenser outside. 10-12 minutes later air suddenly feels cool around 60 F, nice stay chilled air blows from vents. Why Would Fordf350 Truck Air Conditioning Blow Warm/hot Air Intermittently When the airconditioner is on sometimes it works just fine blowing cold air but more times than not, it will go to blowing warm to hot air through. Cold Air Blows Intermittently So you went for a road trip or a long drive, and after 30 minutes of driving realized that your AC suddenly stopped working or switched to blowing warm air. In short, the problem isnt with the AC, its with the car coolant system. Hi Kanboy - there might be a simple fix to this. Just thought I'd share my problem/solution in case it helps anyone else with intermittent air conditioning. Potential causes. The AC light is not flashing. Fixing car air conditioning that dies after a few minutes on hot days How to Diagnose and Adjust an A/C Compressor Clutch in Car Truck - Blows Cold Then Warm A/C Clutch Intermittently Does. My '01 Ram a/c will blow cold airand suddenly, start blowing hot. After stopping the car for a while, that will fix the problem temporarily, but after 5-15 minutes or so the a/c will only blow warm air again. It's also the reason that a plugged heater core, stuck thermostat, or air in the cooling system can all cause a car's heater to blow cold. If it was electrical the compressor would not turn on. When I finished and drove the car for a bit I noticed the AC was blowing hot air. We haven't been able to pin it down to a particular driving behavior - it happens in local driving, highway driving, Max (re-circ) A/C, fresh air A/C. I am the owner of a 1992 Subaru SVX. At first I thought the air conditioning was working fine although it was slow to cool down at first due to the heat soak into the dashboard, but lately the car is exhibiting worse a/c performance and is intermittently blowing warm air when set to max cold (lo-lo with the fan on either full or slightly less than full). My 2013 flex intermittently blows warm especially when accelerating. If your car's air conditioner stops working on a hot day, then the ride to your destination can be quite uncomfortable. Depending on what's causing your air conditioning's problem, you might notice different signs like a lack of refrigerant or a funky smell. This year switching to the defrost setting has not yielded the same results. Not sure what to check, or if I could be low on Refrigerant or what??. What could it be. The next day I went for a drive and got only cold air no matter the setting or engine temp. Cold Air Blows Intermittently. This is a discussion on AC blowing warn air intermittently within the Mustang GT350 General Discussions forums, part of the Mustang GT350 Forum category; I was driving home last week and the AC has started to blow warm air sometimes then it gets cold again. I would drive for 10-12 mins when it sould come on. Replaced radiator 4 months ago, AC works fine - Jeep 2005 Liberty Sport question. A few weeks ago we headed down into Atlanta, which takes us about 40 minutes. Hot air is the last thing you want from your home's AC unit. Presenting Fairlane Cyclone available to buy today online!. Ever since then though, the central air conditioner blows cold only intermittently. This is a discussion on AC blowing warn air intermittently within the Mustang GT350 General Discussions forums, part of the Mustang GT350 Forum category; I was driving home last week and the AC has started to blow warm air sometimes then it gets cold again. My 2012 Verano cools intermittently. When the car is idle, I feel warm air coming from both the driver and. If the defroster is unable to blow hot air, there may be a clog in the cooling system or a malfunction of one of the actuators for the vent doors. My car has an automatic transmission. Frozen AC Unit. When blowing > hot air the condensor fan is still running but the compressor is not > turning. My car's A/C will blow cold air then after a while it will blow hot air them cold then then stay hot. An hour later got back in the car and it was hot again. When the A/C starts blowing warm, turn the ac OFF then ON, observe the VOLT reading. And lastly are you talking about the ac fan blower or do you still have good blower its just blowing hot air? #6. Sometimes the AC works fine the entire journey and other times the AC seems to just switch off by itself. I shut the car off, tried turning the compressor by hand, and there was some resistance, as there should be, but it turned. But, when it isn't working properly, a sunny, summer drive to the store can be brutal. They replaced the compressor again, but we are still experiencing the same problem. A few weeks after that the ac would intermittently start blowing warm air. What's wrong with your car?. But its not heater core problem. It will blow cold shorter times during hotter days. My fairmont seems to have a mind of its own on auto, it will blow cold air for a while then randomly start blowing really hot air to the point where its cooler outside then when its idling it will start blowing cold air again. If I turn the a/c on and off enough, it will eventually blow cold air. Your air conditioning system pulls air in from the atmosphere or recirculates the air in your car’s cabin. Well once we reconnected the battery and had the AC recharged it now only blows out HOT air. Well the weather is warmer now, so i tried, was told to recharge it because it didnt blow cold air. The engine revs consistently went up when the air-conditioning was activated suggesting that the switch and relay was okay. For decades, Mercedes-Benz has been the gold standard of high-end vehicles, and the drivers who invest in Mercedes are never disappointed. When I drive off, it starts cooling. One of the most common summer issues that car owners face is a malfunctioning air conditioning system, and you don't want to get stuck in California triple digit heat without AC. it might be noteworthy to add that. A ride can be even more uncomfortable if you are stuck in traffic. If it was an issue with the heater core both side would not have heat. I have had it recharged and hoses replaced. No matter what I try, the only proven way to get cold air to blow again is to shut the engine off, wait around 5 seconds, then crank back up. Just had the same problem with my 2005 S40. This can be caused by air and moisture in the system that allows ice to form and block the orifice tube. When I start in the morning (with AC on) for about the first ten minutes it blows hot air. If you or your kids accidentally set it to warm, the unit will start blowing warm air to maintain the temperature instead of cool air. Step 1 – Check The Outside Unit. Jetta MK6 A/C intermittently blowing cold 04-02-2015 08:46 PM #1 The a/c takes a while to start cooling off and will get cool if you are at 55 or higher but if you are in bumper to bumper or come to a stop it starts blowing ambient air from outside. Last week I had my AC drained and refilled because it wasn't cooling well. Questions about AC intermittently blowing cold air, then hot, then cold again. This was the exact problem which i faced in my Skoda. Went through all 3 AC systems, verified freon level but all 3 would blow warm air when you sit in the car idling. While I wait on advice regarding my hard starting problem something new just developed today. It's also the reason that a plugged heater core, stuck thermostat, or air in the cooling system can all cause a car's heater to blow cold. Probably like 85* or so. But here are 3 common causes you can fix yourself. 2-5 minutes later air is warm again I have tried cycling the AC, recirculate, temperature settings while in motion. If you are getting warm air you can open the hood to see if the A/C compressor clutch is engaged. The best setting for diagnosis is “fresh air” (not recirculated) with the air blowing out of the center vents in the dash and the AC turned on. the exact same a/c problems started up again - intermittent cold air / hot air when a/c is on. At some point it always shuts itself off and may/may not come back on until it feels like it. Took it to the Honda dealership and he said the AC Compressor and Dryer needs to be replaced which cost me $1500. Hot air is the last thing you want from your home’s AC unit. Air conditioning blowing warm when set to full cold Just wanted to point out that as it could also cause the car to blow warm air when your on low and max AC. Anyone have ideas of how I can determine what is wrong?. My 08 Tahoe started blowing hot air from the passenger side vents. Great Variety of Vintage Car Parts and Accessories Browse a lot of Universal 50 available for sale online. Same issue as others. If your car's air conditioning system is blowing hot air, don't sweat it out. Air conditioning blows cold air intermittently. I just ordered a dash cam and will be installing that as soon as it arrives. com to what a person needs to. Last summer, my AC went warm. But the 10% of the time that it doesn't work is miserable.