For some reason, my air conditioner blows hot air after the engine gets warmed up. The temp gauge does not read abnormal and usually rides under the halfway mark. The freon is full as well. It is the original compressor and the car has 75K on it. The compressor used to kick out when the pressure was too high (and the ac was normal), but now it does not kick in or out.

 

what year range??

 

1995 country lwb 4.2

 

sounds like you have a problem with your compressor control circuit, easiest check is fuse 3 under your hood, if not, you need to start checking different sensors and switches and be sure that youre freon is properly charged

 

I'm trying to diagnose my air problem. I think it's either the pressure switch or the relay. I can't find the relay? Any help would be appreciated?