Automotive Air Conditioning Information Forum

My wife lost A/C in the Kenworth she was driving for work (water truck at a big construction project) and I replaced a couple of bad O-rings, pulled a vacuum and re-charged it for her with the little cans to get her back working in A/C. It can be a pain with those little cans but it is doable.

I ...

With regards to the compressor not kicking on. Without a wiring diagram you're playing a guessing game. My guess is the PCM provides ground to the control side of the relay to energize it when conditions are met for the compressor to come on.

I would check to make sure there is power on the control ...

Thanks. I guess I should have said specifically I was asking about the high side.

I think I figured out last night that GM used a weird high side fitting on cars from 91-93/94 right before they switched to R134. I'm guessing whoever had the car before bought a conversion kit and the high side ...

The other thing you can do is, when the compressor won't kick on, give a little tap on the front of the pulley with the tip of a pry bar or something. Usually the magnet just doesn't have enough strength to pull the clutch in but if you give it a little nudge it'll suck it in the rest of the way and ...

Can someone help me identify this fitting? It’s on a 93 Saturn that came from the factory with R12 but it appears someone did a conversion. My low side coupler snaps into place easily and when I first saw the threads on the outside of this I though maybe they hadn’t converted the high side fitting ...