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

 

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westside5900, Larue, TX, August 19, 2011, 13:09
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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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    mastertech6371 August 19, 2011, 14:00
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     Master

    could be overcharged or undercharged. how do you know it is fully charged?? what are the pressure readings??

    Roy

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