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I just encountered the same problems with the AC compressor shutting on an off every few seconds. I had just recharged the wife's sentra w/ R134a when the problem started to occur. Went upstairs to check the forums and found this thread. Went back downstairs and relieve some pressure on the low line. Problem solved. Thanks! :)
 

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turboAZ2 said:
Yep, usually this problem occurs when the car is overcharged. Because the pressure safety switch is seeing too much pressure. It will destroy your compressor clutch over time. Just bleed a little out till it stops, or buy a manifold gauge set and set the pressure correctly the first time.
i had a guage but it was apparently faulty. It showed I was about 25% full. :(
 
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