Question about 1992 Chevrolet C1500

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I have a 1992 chevrolet c1500 4x4 5.7 litre -when you first start it up,with ac on,ac compressor clutch will engage,disengage 3 times then will not engage,if i run 12 volts to the clutch pressure switch green wire located on the accumulator,the clutch engages ,i am assuming this pressure switch is bad.Do i have to recharge the system if i unscrew this pressure switch and screw in a new one or is there a schrader type valve in there ?

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The pressure switch will open when freon pressure is too low, the compressor clutch is controlled by the computer or module.
The switch isn't necessarily bad, you can check it with a multimeter. The fitting it is threaded onto should have a valve inside and an O ring to seal so no freon loss should happen when removed.

Posted on Aug 23, 2008

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