Question about 1995 GMC Suburban

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1995 GMC Suburban 2500 w/ 6.5 TD

My A/C pump will not come on. Only get hot air in A/C mode. I had the cross over wire connecting the dual batteries detach from the fan shround and fall into the fan where it was cut in two and shorting out all over the place. This was repaired and subsequently noted the issue with the A/C not coming on. The pump is less than 1 year old and has a lifetime warranty from GM. I've checked all fuses and they are fine. Is there some sort of relay I should be checking or replacing?

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  • Stephen Mras Aug 05, 2008

    How do I check the ac relay in the power distribution box?

  • Stephen Mras Aug 05, 2008

    The ac relay is fine. The clutch cycling switch is out. When we jump that, the compressor runs, but it sounds awful. We'll check on refrigerant level. Like I said, lifetime warranty on the compressor, so if it continues to sound bad after refrigerant check, then it goes in for replacement.

    Thanks very much for the help.


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Hi,First check the ac relay in the power distribution box under hood.If it is good, with the ac on take the electrical plug loose from the compressor.Check for voltage to the plug.If there is none,verify you have a full charge of refrigerant.If you do,take the ac clutch cycling switch( low pressure switch ) plug loose.The switch should be mounted on the drier/accumulator or near it on low pressure side.Put a paper clip in the end of plug to jump it over.If the compressor comes on replace the switch.Good Luck!!!

Posted on Aug 05, 2008

  • travis campbell Aug 05, 2008

    Put your fingers on it and have a assistant turn the ac on.If it is working properly,you will feel it click.If you can find another relay that is the same as the ac's and you know that what that relay controls works fine,then swap the two..This should tell you whether or not the suspected bad relay is good.For example if you swap it for the horn relay and the horn worked before the swap and afterwards it doesnt,then it is a bad relay...Good Luck!!!

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