(2007 Honda CR-V) AC works fine when air is cool. This is done using the airflow that comes through the front of your car as you drive. When the A/C does work it cools well. But today I saw the outside temperature was about 55 degrees and I turned the A/C to the blue color (cold side) midway and it starting blowing warm air. There are several reasons that your AC will not cool on a hot day. Db, I’m inclined to think lack of awareness isn’t nearly as common as lack of willingness. 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. AC works perfectly up to about 80 degrees. air-conditioning stops cooling when outside air temp. An AC shop will have the expertise and equipment to do the job properly… and the license to work with the refrigerant. Had symptoms sort of like what was described a while back, would seem cold if it was coolish outside, but no perceptible cooling when it was hot. I own a 2010 Ford fusion and have the problem that the car only blows hot air when it's hot outside. My comment about licensing was in reference to this, but as db pointed out not everyone out there is actually licensed. It engages fine a works for a while. Trying to fix this yourself will only lead to frustration. Regarding licensing, there was a story in the paper here about 15 years ago about a fleet mechanic in Kansas City who was about to be hammered for 5 years in prison and a 100 grand fine. If this isn’t the case, the next car air conditioning troubleshooting tip is to see if there are any leaks. I never heard a follow-up story on what finally happened but I’d think 5 years in the pen and a 100 grand is a bit much; especially considering that many murderers don’t even get whacked that hard. When it is really hot out mid-day and I make frequent stops it starts blowing hot air. But when it is hot outside or the engine is hot (normal operating temp, not overheating) the a/c does not blow cold at all, compressor is not kicking on, air blowing out is at least 85-90 degrees. Its principle is simple. If this is the case, be sure to take it into a mechanic as quickly as you can. 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. TLDR: AC not working when hot outside, but system is charged. I bought a used car and its the first winter since I had this car. When the a/c is working, and compressor is kicking on, it will switch from max to regular a/c no problem & have no issues with changing the vents. The air works fine in the early AM and evenings. borisd89 in Newton Center, MA on July 09, 2014. December 17, 2015   |   1. My air conditioner works well until the weather gets humid and above 90 degrees. Depending on the age of the car, and how hot the area is in which it is driven will determine if fixing the compressor is worth it to the car owner. Once the outside temp rises compressor stops engaging and AC start blowing hot air. If the valve is blocked, the refrigerant flow could be restricted or could be too unrestricted. And that heat has to be released to the ambient air, otherwise the whole process quickly comes to a halt. after that i turned it back to cool and turned on the ac ( a few hrs into the day when the temp was rising) and it only blew hot air. Phoenix guy agrees 100%. That helps clarify the entire process. https://www.wiseautotools.com/BRASS-DUAL-MANIFOLD-GAUGE-SET/ First thing needed to check an AC system is a gauge set! 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. 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. For me that helps to understand the process of heat being transferred from the cabin to the refrigerant and the refrigerant to the outside air. When I stop the car at a red light or just parked, hot air starts to comes in with some kind of clicking sound from engine (might be from this belt that I have seen that rotates then just stops and … When I take the car out of garage the A/C cools well but as I start driving and if the weather outside is hot, the A/C stops cooling after some time. Why does the air conditioner stop working in very hot weather but ... 38. For the OP’s edification, we’re talking about the EPA’s regulations for handling refrigerants containing HFCs. Or if stop in a parking and AC is on, when you start moving it stops working. 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. If the compressor turns on then instantly stops it could be either you are lacking freon or there is too much in the line. The compressor on a car air conditioning system can break, which is the most costly repair on a car’s air conditioning system. However, in Parker Co the causes behind such overheating may differ. 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. If you suspect a refrigerant leak, take your car to General Automotive. Has anyone had this experience? When I take the car out of garage the A/C cools well but as I start driving and if the weather outside is hot, the A/C stops cooling after some time. A simple loose hose is all it takes for an air conditioning system to have a reduced flow of cold air. 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