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Q:

a/c problem on 1999 GMC Sierra 1500

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the clutch on my a/c clicks off intermittently when I turn on the a/c. It will not run long enought for the compressor to come on. What is the problem?
(1) Answer
You may have a faulty pressure cycling switch, located on the a/c accumulator of your 1999 GMC Sierra 1500. If you tap lightly on the pressure switch with a screwdriver handle and the compressor turns on, replace the switch.