Question about 1992 Chevrolet K1500

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I have a 1992 silverado 1500 with 2 problems.1st,the a/c does not work,specifically no power to the compressor,hook direct to the battery and it works,but still no a/c.2nd,when I start or shutoff the engine I get a thumping noise from under the dash for about 15 sec.the blower works fine.are these 2 related somehow?how di I fix? thanks.

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  • yadayada
    yadayada May 11, 2010

    if the system is low on charge the system will disable the compressor through the low pressure switch. not really clear on what u are saying here.

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You have a mode door actuator failing inside but that will not interupt a/c compressor clutch.Start bypassing pressure switches and check relays for that problem...good luck

Posted on Jun 28, 2009

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