回复：LOL, how difficult to shut up

Are you sure that the coolant temp has nothing to do with AC system?

In fact for some newer model year vehicles,when the coolant temp is above the pre-set parameter, the ECM will shut off the AC.

I think the first thing should be done is to solve the overheating, then check AC.

From the descriptions given, I fully agree with biglow. Most likely is because a partially clogged radiator.

Good luck!