This fan is the same one that works to blow hot air into the car during the cold winter months, so it’s essential to have the ventilation fan fixed. The cooled refrigerant is then expanded to drop its temperature and sent back to the passenger cabin heat exchanger to once again absorb the cabin heat. If the condenser is blocked by some type of debris from the road, then it will be unable to properly cool the refrigerant and your car’s system will continue to operate with overheated refrigerant. If the day temperature is generally high and the garage is hot then the A/C will not cool right from the beginning. '95 Jeep Wrangler A/C stops working when it's hot outside. It relies on the principle that expanded matter absorbs heat (it’s cold) and by removing the heat from the compressed refrigerant (matter heats up when compressed) and then expanding (chilling) it, it will by using a heat exchanger absorb the heat energy from the cabin. Hope, this guideline on how to fix car ac blowing hot air helped you out to get done with the issue of car ac blowing warm air intermittently. Science information about stratospheric ozone layer protecting humans and earth from ultraviolet (UV) rays, In all seriousness, many, perhaps most, of my colleagues had no idea you’re supposed to be 609 licensed in order to work on automotive ac systems, The shop owners probably know about the regulations, but I think in some instances they don’t bother to have their guys become certified. TLDR: AC not working when hot outside, but system is charged. This is an easy repair, and one that many car owners can do on their own. 5. There’s nothing worse than being stuck in sticky humid weather when the AC unit fails to release cold air or stops working altogether. But when stopped in traffic AC stops working and will turn back on when car is running for a period of 15+mins in expressway. Phoenix guy agrees 100%. In the case of a car, the heat is transferred from a heat exchanger in the passenger compartment to a heat exchanger in the engine compartment. While the car is in movement A/C works fine in all weatheer conditions. Trying to fix this yourself will only lead to frustration. Sometimes, the compressor might completely stop working due to overheating, which is one of the most common problems plaguing an AC. Like many other maintenance issues, the signs that the AC is failing may be hard to notice over the years, prompting many drivers to assume everything is fine. Prius AC is as strong as any other car I've owned. The refrigerant is then recompressed, and the heat from the passenger cabin along with the heat created by compressing the refrigerant is then transferred by the heat exchanger under the hood to the ambient air. The list goes on and on. However,it doesn't seem to be dependent upon outside temperature.Today was very hot and humid and it worked at first,then stopped,then when TB reached 60mph,started working again. The air works fine in the early AM and evenings. When the A/C does work it cools well. Sometimes they’ll just stop rotating b/c they are broke, but they can appear to be working but not rotating as fast as they should too. 4. whenever the ac is blowing hot air, the fans were working and also the compressor was engaged and working. The AC seems to be dependent on outside temperature: on very hot days ~95 degrees the AC will only work for ~5 minutes before blowing hot, 80 degree days the AC works longer, limited testing in cooler weather (at night ~60 degrees) AC always blows cold. . I bought a used car and its the first winter since I had this car. A/C in summer was working just fine. A/C doesnot work when its hot outside. 2006 Honda Civic, 150k miles. Try bleeding the system a bit while compressor is off. December 17, 2015   |   To make it easier to record the information, download our air conditioning diagnostic sheet; this will guide you through the process. (2007 Honda CR-V) AC works fine when air is cool. If the compressor turns on then instantly stops it could be either you are lacking freon or there is too much in the line. I am not sure if this is expected or not when the outside temperature is low. The expansion valve distributes the proper amount of refrigerant to your evaporator. It might help readers to understand that cold does not travel, heat does, “heat” being a measurement of atomic activity. I've had my baby for almost 22 years now, but this is a fairly new issue. Why Your AC Condenser Fan Motor Keeps Overheating, Gets Hot, and Stops Now that you understand what a condenser fan motor is and how to tell if it is what’s causing problems with your AC, let’s talk about the why. Has anyone had this experience? Once the outside temp rises compressor stops engaging and AC start blowing hot air. If this isn’t the case, the next car air conditioning troubleshooting tip is to see if there are any leaks. When one doesn’t know a thing about air conditioners in a car, this can be done quickly at an auto repair shop by a mechanic. Does it fail on the highway or in stop-and-go traffic? That could point to a frozen evaporator. High exterior temperature may be causing excessive low side pressure which will keep the compressor clutch from engaging. What to Do If Your Car Air Conditioner Stops Working October 7, 2015 In 1969, only 54% of domestic automobiles included air conditioning, and those of you who were around in the pre-AC days can attest to the sticky, sweltering discomfort of driving on a hot summer day. That helps clarify the entire process. When I pull the car into my garage and let sit for a few minutes, AC works again. Or if stop in a parking and AC is on, when you start moving it stops working. 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, be sure to take it into a mechanic as quickly as you can. Blower works fine, but only warm air blows from all vents. Turned out to be a compressor failure in progress. Blower works fine, but only warm air blows from all vents. AC works perfectly up to about 80 degrees. i have a 2000 Toyota, sienna, the ac was working super cool until something punctured the ac pipe under the car which supplies Freon to the back evaporator and all the gas leaked out. Since heat flows faster if the temperature differences are greater, as the ambient temperature increases, it becomes harder and harder to transfer that heat in the engine compartment heat exchanger fast enough to the outside air. When the A/C does work it cools well. When it is blowing hot air, the clutch on the compressor hasn’t engaged. 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