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Q: What would make the A/C turn on and off. on 2009 GMC Sierra 2500 HD

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
It is Fully Charged, The low Pressure Switch has been replaced. but it still turns on and off on its own. The fan does not tirn off it is only the compressure.
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could be overcharged or undercharged. how do you know it is fully charged?? what are the pressure readings??

Roy
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