Air Conditioner Problems - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-03-2005, 09:27 PM   #1
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Default Air Conditioner Problems

I just tried my A/C for the first time this week, and when I tried to turn it on, I just got vent air. I tried adding 134a, it was on the border of being low, but it didn't help. I think either there is something wrong with the compressor or something wrong electrically that is preventing it from being turned on, because when I go between vent and A/C, you don't hear that sound that the compressor usually makes. Is there anything like relays, etc that I can check on my own before I pay someone to fix it?
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Old 06-03-2005, 10:30 PM   #2
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Well, there is a compressor clutch relay that has start permissive interlocks to protect the compressor. Those are high pressure cut out, and low pressure cut out. I believe there also might be an interlock with the ventilation blower, and also the throttle position, WOT cut out. So there'* quite a few things to look at here. Start with checking to see if the refrigerant charge is up to par.
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Old 06-03-2005, 11:21 PM   #3
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The refigerant was at the lower limit of what the can said was ok, so i added a little more, but it didn't help. Where are the relays located, I looked in the maxifuse panel, but there'* no chart under that cover saying what the relays are for.
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Old 06-04-2005, 04:27 AM   #4
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I just supplied you with generalized information. I was hoping that one of the 92-95 gearheads would chime in. I'm more knowledgable on the 2000+ Bonnevilles although they are very similar in operation to the older.
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Old 06-05-2005, 10:27 PM   #5
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Thanks for the advice, hopefully someone here with a service manual could tell me the positions of the different relays.
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