Based on your description of the problem our guess is that your air conditioning system is either tripping off due to overpressure or you’ve got a short somewhere in the system that only shows up when things get really hot under the hood. But once I’m idle-ling, it blows hot air again. What could it be? To prove this you would have to check your AC high side pressure it a higher engine RPM after your car has been warmed up. blair. If your system tripping off on high pressure because it is overfilled with refrigerant the dealership that did the work should fix the problem free of charge to you since they made a mistake refilling it after the work. You may want to bring the vehicle to an A/C specialist for a proper diagnosis. If the system has the correct amount of refrigerant but there is a clog, it could cause an extremely high pressure on a hot day and similarly trip the system off due to the overpressure. The AC blows great after the 4 to 5 mins. If the system is undercharged, the A/C pressure switch may be cutting the compressor on and off, causing the engine to surge and the sound you are hearing. Thanks again for your question! You mentioned the low side pressure being normal but we would recommend checking the high side pressure on a hot day with your car warmed up to see if it gets too high. From the sounds of it, you may be experiencing a slow refrigerant leak. Also, since your car is so new, Honda may diagnose and fix the problem free of charge to you under warranty so we would recommend taking it to a Honda dealer to get things checked out. Hi I have an 07 Honda Odyssey and the AC blows out hot, there was white smoke coming out but it’s not coming out anymore and the air is still blowing out hot. From the sounds of it, you may be experiencing a refrigerant leak. Thanks for your question about your Ford Freestyle. I have 2008 Nissan Altima. This high pressure, now cooled, refrigerant is then allowed to expand quickly as it passes through an orifice or expansion valve. Hot air coming from car vents? I don’t know what next to do. Feel free to contact our technical support line at 888-863-0426 with any other questions. Thanks for your question about your Camry. 2. My 2009 GMC Yukon XL is bowing hot air on the driver’s side. Could this be a more serious issue like needling to replace the condenser and compressor? I have a 2003 Chevy Silverado my AC was blowing cool air not cold up until a couple days ago. Thank you for asking about your Chevy Tahoe. These pressure readings will give you a better indication as to what the issue is. Nothing but hot air coming from the vents. Getting to the root of the problem can take some time and effort, but we have simplified the process by providing you with the most common A/C problems along with how to resolve these problems once they’re discovered. Now that she is ready to drive again, we replaced serpentine belt, pulleys and battery. Thank you for asking about your Toyota Rav 4. Thanks for your question about your 2014 Nissan Altima. All the games you have to play to get cold air to blow from the right vents does sound more like the flapper doors in your ventilation system are actually blocked or broken rather than the actuators being bad. Any advice? Could a vacuum line have come loose or something like that? The a/c does not get cold in the morning when it is cooler outside but works perfect in the afternoon when it’s hot. but later that night it started blowing warm air!! Based on your description your system could be over filled with refrigerant or you may have a faulty pressure or temperature switch. 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. now my a/c dosent work! I’ve had freeon replaced and that would only work for a couple hours. Based on your description, the system could be low on refrigerant. Your HVAC ducts are likely a big snake across warm components, around a heat exchanger and very close to it. But now the A/C is not working, blows cool air on cool mornings and warm air on hot days. Passengers side and rear is hot. A few hours later I drove the truck to town. fans never go into high speed, only low speed. Ask the mechanic to check for leaks then repair if necessary. It sounds like your leak is a little bit too extreme for what the Red Angel is intended to fix. When I left the mechanic it was great nice a cold and now at the end of the week its blowing hot air. Checked the system and it was just on the low side of being full. When I turn on the “real” hot air, the this unique hot air stops. I was told the compressor went out so I had another one put in. If your heater core is clogged, try using BlueDevil Radiator Flush (available here: http://store.gobdp.com/radiator-flush-00204/). I’ve checked, it has freon. Thank you for asking about your Buick Regal. Thank you for asking about your Lexus. On warm days the pressure in your AC system is higher and if your pressure sensor is faulty and reading too high it might trip the system off on warmer days. It seems to happen when the car has been sitting for some time regardless of the temperature outside. It may be worth opening up your ventilation system to check the condition of the doors and look for blockage. Similarly, if your AC condenser fan isn’t working, your air conditioning would blow cold until the condenser got heat soaked then it would stop working until you were up to cruising speed then the air blowing over the condenser while driving would cool it down and keep things working. The hot air feels like it’s the engine’s hot air passing through in the off mode. Thank you for asking about your Pontiac Grand Am. Thank you for asking about your Lexus RX 350. It would be very unlikely to have 3 straight compressors be faulty from the parts store. Any suggestions on what this could be? From the sounds of it, you may have a slow refrigerant leak, which is not allowing the system to continuously blow cold air. Although an automotive AC system has few moving parts, diagnosing why your car is blowing warm air can be tricky. More often than not, when a car is blowing hot air only at a stop, the problem is with the electric cooling fans. In many parts of the United States, air conditioners aren't just a luxury, but a necessity during the summer months. When I start driving, after 5 to 10 mins it blows Luke warm. Even if the coolant level was just a little low, it could cause you to have an issue getting proper heat. Something else to consider would be if the evaporator has frozen. The shop that replaced your compressor should have flushed out the a/c system and replaced any non-flushable parts before putting the new compressor in. Everything works but no cool air coming through the vents. Hello, Why You Cannot Afford to Put Off Heating Repair. I assumed this problem was caused by low refregirant so i had some added. I have a 2000 buick Century when you turn on the a.c. it blows warmish air but when switched to heater it only blows warmish air and doesn’t heat up either, What could cause this? If i’m moving when I turn it on and don’t stop it will stay cold, (like driving on the interstate) but once I stop and then start moving again it goes hot. The more i accelerate the more heat is peoduced. Added some freon to get near 40psi. This has happened 3 times so far this spring, do you know what the issue could possibly be? Thank you for asking about your Dodge Ram 1500. Compressor turns on, condenser is clean and a new cabin filter. So far these are the observations i’ve made. The compressor will work harder as outside temperatures climb because the air-conditioning cycle requires the outside temperatures to be lower than the heat being released from the unit. Take note that a clogged condenser is just a contributing factor to why the car air conditioning blows hot air and not blowing cold air. Any local shop with a good scan tool should be able to do that for you. Any ideas of what is causing this problem? I noticed issues with the ac when i would turn it on i can hear everything come on. Hopefully, by adding more refrigerant your system simply got over filled and has shut off due to a high pressure switch being triggered. Thank you for asking about your Nissan Altima. The compressor clutch starts to engage and disengage regularly. If your car’s air conditioner isn’t working properly and is blowing hot air then one of these systems isn’t doing its job properly. Thank you for asking about your Toyota Camry. When car engine is cold A/C works cold until car gets up to operating temp around 200 degrees f after 20 minutes or so of driving when extreme hot outside. When the heat is on, the warm air blows, but otherwise, it's blowing cold air - it almost feels as if it's A/C air. My Mom has a 1997 Saturn SL2 sedan (dohc engine) that we replaced entire A/C with a new kit from Napa in 2014. The acuator, freon and coolant have all been checked and not the issue. It blows cold air when it’s not real hot outside like 75 degrees. Try setting fan to off and it should stop. I been having problems with my car's air conditioning. Yes, but not in the way you'd think. Air conditioning can be used in both domestic and commercial environments. I have a 2014 Nissan sentra it was blowing nice and cold air then just quit. To check this, you’ll have to dig into your vent ducts and test that flapper door. Is this normal? Thanks for your question about your Dodge Charger. Try having the a/c flushed and then charging it back up with refrigerant. We recommend using the Red Angel A/C Refrigerant Stop Leak to help stop the loss of refrigerant and return the system back to form. I’ve heard of some GM cars doing this (fan always on), but I’m not aware of any Ford cars that do. Be sure to replace the AC filters as often as recommended by the manufacturer of your vehicle. If you’ve got an automatic climate control system in your Tahoe it’s possible that the dead battery caused it to malfunction and shutdown. Thank you for asking about your GMC Yukon. Second, it could be that your AC clutch is malfunctioning and on warmer days, or when more load is on the system it fails to engage the AC compressor which would cause your system to not operate correctly. Required fields are marked *. When the temperature reaches above 85 degrees or higher, the AC will runs cold for 5 minutes then go hot. We recommend using the Red Angel A/C Stop Leak (http://store.gobdp.com/a-c-stop-leak-49496/ ) and then topping the system off with the proper amount of refrigerant. Based on your description, we recommend checking the refrigerant levels to make sure you are at the proper level. Based on your description, it is possible the wrap core is clogged. I have a 2006 chevy malbui my a/c is blowing out hot air I put 1 can and half can of freon in it it still blows hot air and then it blow cold air then goes back to blowing hot air again what could cause that,. Feel free to contact our technical support line at 888-863-0426 with any other questions. The condenser’s job is to cool the warm refrigerant that was used to make the air cold in the evaporator. Use the product as directed and then top the system off with refrigerant afterwards. I do not have the air/ heat on in the car yet sometimes as I'm driving, really hot air comes out of the vents. The reason you are hearing the surging sound from the compressor could be from a loose connection or a faulty electrical component. It’s possible that you have too little refrigerant so your system won’t kick on until things warm up and the pressure goes up in your system. Your problem could be in your ventilation system. My 2013 VW Passat blows hot air (like a heater) most mornings. This is a particularly useful trick for locating coolant leaks, and figuring out if the smell is coming from your engine bay or heater core. No – If you’re heading off-grid to where there isn’t an electricity hook-up, you can still have a portable AC unit. Learn how you can save money by installing a new energy efficient central A/C unit. There are a few possible problems you might be having. Air would be blowing cold for 2 seconds and then it switches to hot air. It’s possible that your air conditioning system is overfilled and when your engine is at a higher RPM the pressure gets too high and the system trips off on overpressure. Thank you for asking about your Honda CRV. This did not solve the problem either. Thank you for asking about your Toyota Camry. You can try checking the servo for operation but you may have to take your car to a Ford dealership to have them run a diagnostic on the ventilation module. Electrical smoke drawn in through the fresh air vent is probably coming from the engine compartment, perhaps as a result of a wire touching something hot like the exhaust manifold. Running the A/C when it’s overcharged can damage the compressor and cause additional issues, so get it taken care of as soon as possible. Any thoughts or suggestions on the problem would be greatly appreciated!! Thank you for asking about your Nissan Altima. This will help seal your refrigerant leak and return the cooling system back to normal functionality. This is accomplished by first compressing the refrigerant to a high pressure which also heats it up to a high temperature. Is it possible it just needs freon in it? Another possibility is that the condenser is contaminated with debris/dirt and refrigerant isn’t cooling properly. What you think might be the issue? I have a similar issue and would like to add detail. To help keep the car DC to AC converter cool, the model features three high-speed, thermally activated turbo cooling fan. I’ve got cold air. The A/C will sometimes work GREAT. On warmer days, your AC system pressures get very high so if it’s overfilled it could be tripping off on an overpressure causing the warm air and if you have a bad pressure or temperature sensor it could be inadvertently shutting your system down because the sensor is reading incorrectly. Have you checked to see if you are low on refrigerant? What Problems Can Head Gasket Sealant Fix. If the system appears low, we recommend using the Red Angel A/C Refrigerant Stop Leak, and then topping off with refrigerant to get the system back to normal functionality. These motors and doors are located behind your dashboard and take a good amount of work to get to so you may consider taking your vehicle to a mechanic to have them checked out. 2b) As soon as I use the trottle or set the fan to max strength, air only blows out of the windscreen vents. The rest of the hot coolant is regulated by the thermostat, which maintains a consistent engine temperature that does not rise above or fall below the engine’s normal operating temperature. Based on your description, it is most likely blowing hot at other temperature settings due to a low refrigerant charge. You can try flushing the A/C system first to see if that alleviates the situation. I leave it on the same settings, so I’m not changing anything. After 20 or thirty minutes of driving, when i turn of the AC and turn it back (1 minute delay), the AC starts working. in this case what can i do. Any time a system is converted from one refrigerant to another it also makes diagnosing problems difficult since the system is operating as it was originally designed. Last week, somewhere in rural Nebraska or Colorado, the A/C suddenly started blowing only hot air. Thank you for asking about your Mom’s Saturn SL2. They also checked and said there is no leak. 2009 Uplander repaired line to rear and took it in had it vacuumed and filled – worked good at first but after a month no a/c. I went upstairs to find water rapidly dripping from the bottom of the unit. Since you mentioned different temperatures coming from each vent, out guess is that you’ve got a problem with your ventilation system, most likely a blockage in the air box causing the air blend door to not close fully and the air flow to be disrupted to the vents. Due to the high pressures of your air conditioning system and the volatile nature of the R-134a refrigerant used, it is not uncommon for some of the refrigerant to leak out over time causing a low pressure condition in your system. Dirty air filters reduce airflow through your AC and help moisture remain inside the unit. I put some refrigerant in it and it held. Even if your AC is on, your heater should still warm the air back up. Thank you for asking about your Honda. For a novice, the place to start here is by doing a visual inspection of the wiring to see if there are any that are damaged or frayed. Based on your description, you may have some kind of a restriction in the system, not allowing proper circulation. Your vehicle is new enough that the ventilation system should store an error code just like your engine would if something goes wrong. You figure out how long they were there and you decide if it was worth it. If you do not have enough refrigerant in your car’s A/C system the compressor may not be able to raise the system pressure high enough for the expansion valve to be effective in cooling down the refrigerant. Thank you for asking about your Mercedes Benz c230. Need advice on a dealing with a blown head gasket? If your system has too much refrigerant in it, the pressure will quickly get too high when you first turn it on causing it to trip off on over-pressure then as things cool down it would kick back on. He then said I needed a new A/C compressor. i use a honda city ivtec 2008 model. You can refill the system and see if that corrects the issue. Thanks for your question about your Nissan Altima. Hello. ALL CARS sold in the US have heater cores. I have checked the pressure levels on both the high and low sides (both in the morning and afternoon when its hot) and they all checked out normally. If that doesn’t fix the problem then the servo motor or the door placement indicator is probably bad sending a bad signal to the control unit. The air conditioning system in your car is designed to cool down the air in the cabin of your vehicle to keep you comfortable on a hot day. Then type in TACO AIR VENTS and get the cost of those vents. If they are even slightly open, or not well sealed, warm air will pass into the passenger compartment, even if you have your heater control set on Cold and the fan on Off. Brand New 2020 Ford Explorer. Thanks for your question about your Skoda Octavia. When I first turn the a/c on it will blow cold. Started up this morning and turned on air. Hey I have a 2004 Nissan Altima the a.c. was blowing cold when my coolant was low I replaced my thermostats and topped of my radiator now my a.c. is blowing hot any ideas. I also put a litlle bit of stop leak in it but it still blows hot. 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