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'91 GMC Air conditioning problems.

12969 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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tried to bridge the low pressure switch, but no go...the compressor will not fire what?
I noticed that the high pressure schrader valve was hissing slightly..fixed that, disconnected battery, jumped the low pressure, reconnected battery, started vehicle and set air to high and dumped a couple cans of super secret R-12 and I'm cold....thx everyone
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