When the temperature outside is cooler, say less than 80°F, and I turn my AC on, everything works great and I get nice cold air in the car. In the late afternoons however when the temperature is above 90°F, I get cold air for 2-3 minutes then I hear a 2-5 second groan followed by about 5-10 seconds of warm air and then everything returns back to normal again with cold air blowing for another 2-3 minutes before the cycle repeats.
Anyone have ideas of how I can determine what is wrong?
The AC is the type where you just choose a fan setting between 0 - 4 (no thermostat to keep it at a set temperature). No work has ever been done on the AC.
I can visually see the AC compressor turning on under the hood when I turn the AC on in the car. Also worth noting is that my car sat for 3 weeks without being started while I was on vacation and this problem developed only once I got back and started driving it again.
Thanks for any advice.