The car is a 1997 SS with an obd1 swap. The compressor just quit working. The clutch wont kick in. The high side pressure is 230 when running and low side is 35. The A/C was wroking fine, than quit, I turned it off, waited 5 minutes, turned it back on, and it worked for a little while, now it wont kick on at all. The clutch does cycle ocasionally. The relays for the fans and A/C are all fine. The wires that I can trace are all fine, the fuses are good, and the compressor is a rebuilt unit that I picked up 2 years ago and has always worked well. Any ideas would be appreciated. Thanks Eric L

 

UPDATE: LOL, now its mysteriously working just fine, ARGHHHHHHHH. I swaped the pressure switch with a spare I had also to eliminate that. That was earlier. I just went out in the garage and fired it up after I posted, and it wouldnt work................than it just came on. I unpluged, and pluged in the pressure switch and the fans and compressor switched on and off just like they should. Now it could last a day, and hour, or who knows. Lol, any input. Thanks, Eric L

 

You said your low side reading was 35psi is this when the compressor clutch is running or when the system is not working at all.

 

Both high and low side readings were taken when the system was running.

 

those readings are around where you want them to be. So hopefully it is just a sensor like you said.

 

I eliminated the sensor earlier in the day, I have no idea why it started working again. I drove it 22 miles to work today, and 22 miles home and its still working fine. I dont get it, lol. Now, if only I could get rid of this irritating rubber on rubber squeek coming from the back of the car, lol. Eric L

 

UPDATE: It just reared its ugly head again. When A/C is commanded, the compressor, AND the fans wont come on. Any ideas? Im lost. Again, pressure is fine, when it DID work, it was ICE cold. I eliminated the pressure switch. I dont believe there are any other switches in the system. Im thinking this might be an ECM issue possibly. Any input is apprecieated. Eric L

 

OH.....................MY......................... ....GOD. Now, im REALLY confused. I did as fastbird said, over on LTXtech. I pulled the plug on the compressor, tested voltage with key off as a control. It read 0, good. I tested it with key on, it read 0, kinda as i figured. I started car, multi meter read 13.4, I says, darn, sounds like its an electromagnet in the clutch, damn. So I turn the car off, and plug it back in. Just for grins, I start the car BACK up, turn the AC back on, and CLICK...................................The DARN compressor kicks on, ARGHHHHHHHHHHHHH. What could it be? A bad connection at the compressor? I disconnected the battery and pulled all the fuses earlier to do a master reset. I even swaped ECMs. WTF. Yeah, im glad its working, but if I dont figure out why, im no further than i was before. DUDE. lol, that is all, lol. Eric L