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'91 GMC Air conditioning problems.

12967 Views 8 Replies 6 Participants Last post by  danomt
My air has always worked well but the compressor always made what i call a groaning noise when it operated and I could hear this inside the truck. I have owned this truck since it was a year old. Once in a while the AC would flash on the heater control and I would disconnect the battery and reset and it would work again. Now the AC doesn't work at all and the AC flashes every time I start it up. Is this more than a recharge problem? it worthwhile to try to fix?...thx
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If it's lost enough freon that it won't engage the pressure switch then the compressor won't run at all.
I wouldn't fault the compressor just yet, as mine has growled & knocked for 9 or 10 years. You can do a quick bridge of the pressure swtch (should be on the rec drier by the firewall) & if your ac clutch kicks in, then it's just low on freon.
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