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air conditioning on 1995 Chevrolet Impala SS

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My a/c is working off and on. For months it will not work, then I had it checked and it worked for about a month and now it is not working again. When it is not working, I can sometimes hear the clutch engage and other times it does not. I got an estimate for $1100 to fix everything, but didn't do anything because it magically started working again. Looking for a cheaper solution if possible.
(1) Answer
One thing that comes to mind is the pressure cycling switch which is screwed onto the side of the accumulator. Some time when you have the A/C turned on and it is not working - the compressor is not engaging - try taping the cycling switch with the handle of a screw driver. If the compressor comes when you tap the switch then a new switch may be in order. You should not need to discharge the A/C system to change the cycling switch. Good luck!