Question about Chevrolet Silverado 1500

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When idling the a/C compressor just kicks on for a few seconds then disengages

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You need to add some refrigerant (R134). Whats happening is that since it is low on regrigerant the compressor sucks the low side below the cutt off pressure turning off the compressor, then pressure at the low side builds up again quickly and turns the compressor on again then sucks it back down again untill it turns off and the cycel goes on and on untill you add enough regrigerant in there. Here are some caution do not overcharge the system. Overcharging will make it not get cold properly and will damage the compressor costing you a lot more money. The low side should reach a minimum of 35 psi with the AC blower on maximum. This keeps the compressor on all the time. If say you were to put the blower on minimum the evaporator would get really cold since the air passing through it is less. This would cause the low side pressure to dip down gradually until the compressor cuts off, and that is how the system basically works

Posted on May 28, 2011

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