Question about 2001 GMC Savana Cargo

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Idle issue when a/c is on

On my 2001 gmc savana van I am having issue with the a/c compressor turning on and off I have replaced the compressor and both high and low sensor but the compressor keeps turning on and off making my van idle bad what can be causing this?

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  • GMC Master
  • 40,854 Answers

The ac compressor is controlled by the thermostat connected to the evaporator under the dash When the cab air temperature reaches the set temperature the ac compressor switches off . IT is called cycling. If it causing a problem with the engine rpms then there is a sensor problem not an ac problem so run the fault codes to determine where it is . ECM's are programmed to maintain constant rpm regardless of the load placed on the engine at idle.

Posted on Mar 24, 2014

  • kevin
    kevin Mar 24, 2014

    there is no codes not in the pending or the history. the thing is that it only does it when the a/c compressor turns on. if I turn off the a/c them it wont do it. and the van has no misfire and the freon is filled to the correct amount. The compressor is cycling to much it turns on and off every minute or so.

  • Bill Boyd Mar 25, 2014

    the problem is in the ac system and if you did not use a pressure gauge to fill the system then it is not to the right amount . have an accredited ac specialist look at it as you may have more wrong in the system ( blocked receiver/drier and faulty TX valve.)

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could be a bad fuel pump, or fuel pump relay. they are having problems(a lot) with the ethanol in the gas on GM products.Fuel pumps sales are through the roof at parts house on GM's. Have a pressure check on your fuel system. That is probably it. Add a can of Seafoam to your fuel every 3000 miles to alleviate this problem.

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Posted on Jun 12, 2010

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