Automotive Air Conditioning Information Forum (Archives)

Provided by

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

No compressor clutch engagement

Merc on Sun August 23, 2009 6:54 PM User is offlineView users profile

Year: 1992
Make: Pontiac
Model: Bonneville
Engine Size: 3800
Refrigerant Type: R-134a
Ambient Temp: 0000000
Pressure Low: 0000000
Pressure High: 0000000
Country of Origin: United States

When I bought the car there was a sticker under hood that says it was retrofitted to R-134a. A/c has always worked fine. A few days ago I noticed a noise that sounded like the tab that scrapes the rotor when the brake pads get low, I think the sound was coming from the compressor and I noticed that the a/c did not work any more. After trying it several times it started working again and I did not have the noise anymore but the a/c stopped working again. I hooked up a cheap guage and it showed "GOOD" for refrigerant. I think that was the last time the compressor clutch came on. The fuse in fuse box is good. Not sure what I should do next. I think I will unplug the compressor, insert 12 volt tester, turn key on and see if I get any juice. Does car have to be running or key in on position good enough? Any help or suggestions would be appreciated in troubleshooting this issue.

Chick on Sun August 23, 2009 7:21 PM User is offlineView users profile

Try jumping the two wire cycling switch and see if it comes on and blows cold..If it does, the switch might be bad, if not then check for 12v at the compressor, or jump the relay..If you have auto AC you might need to reset the computer by disconnecting the battery for a couple seconds.. If the compressor comes on and not cold, you need the pressures checked..both high and low while running..

The scraping noise could be a bad clutch gap, but you need to find out why it doesn't come on first....

Email: Chick


Freedoms just another word for nothing left to lose

GM Tech on Sun August 23, 2009 9:23 PM User is offline

'92 "H" cars were known for bad A/C relays- tap on it when compressor quits-- see if compressor comes on...

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.