Question about 1999 Chevrolet Suburban

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High idle with a/c on.

Engine 5.7L v-8 idles high, 1000rpm, with a/c on and won't come down until vehicle comes to a complete stop. with a/c off engine idles normal at 500rpm. I have cleaned the two air intake valves in the neck of the intake manifold with no help. Also check engine light is not on.

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  • pethousefive Sep 17, 2008

    thanks for your help!

  • Anonymous Mar 25, 2014

    check engine light comes on, and idles very high



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Cars are SUPPOSE to idle higher when the A/C is on...(especially 134a systems)..the idle will go up and down as the compressor cycles on and off.

Posted on Nov 19, 2008


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