The car is a 1995 Buick Lesabre (not sure if it's a Custom or Limited). It has manual climate control, an automatic transmission with a 3.8L V6.
The car's AC system wasn't blowing cold air. I was told the compressor was replaced about two years ago with what appears to be a remanufactured unit.
The first thing I noticed was that the compressor clutch never engaged or even appeared to attempt to when turning on the AC. Below are the diagnosis steps I've performed so far:
1. AC fuse is good
2. When turning the AC on, the relay does "click", but I did not check it beyond that
3. There is voltage (~12v) at the compressor harness (green wire) when the AC is engaged
4. I unplugged the refridgerant pressure switch and jumped it to ensure it wasn't an issue with freon level and found voltage at the compressor harness when jumped and zero volts when not jumped
At this point, my thinking is the compressor clutch being the culprit, but the owner said she never heard any strange sounds coming from the car when the AC was working.
I'm taking another look at it again tomorrow to test the ground connection at the harness thinking possibly it could be the issue as well (my voltage test was grounded at the battery). Beyond that, I'm not sure where else to look.
Is there a part of the electrical diagnosis that I'm missing or am I correct in thinking it's the clutch?
Thanks very much for the help.
have the same problem?
Tuesday, May 7th, 2013 AT 4:37 PM