During the past summer months, some owners complain about the heat inside of their cars and the inability of their air conditioning units to quickly provide cool air. You have to keep in mind that the A/C is only going to blow air that’s a maximum of 40F cooler than the outside ambient temperature. So even if it’s working at tip-top shape, when the outside temps are really extreme like 110F or something, the air coming from your A/C May only be 70F. That doesn’t sound like a working A/C to most people, but the systems have a limit on the amount of heat they can remove from the air, and IIRC it boils down to about 40F cooler than ambient. To help the system out, you should run it in recirculation mode when it’s really hot. That way, it only has to cool down the air inside the car, as opposed to the hot air outside the car. Another thing you can do is to install ceramic window tint. Unlike metallic tint, it won't interfere with your cell phone and will help to keep interior temperatures down.
Really how does your a/c know what the outside temp is. I would say not true, you can take a temp reading inside of the car at the vents and get a true temp reading of how cold it is blowing.
An A/C unit in good working condition blows cold air in the 40-42F degree range. What I was trying to say, is that the A/C air coming out of the vents will not seem as cold (if your system is not in recirculation mode) when it is mixing with very hot air from outside your car.
