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

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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??

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