Question about GMC Envoy

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When i activate the air condition the engine meter, goes up and down.

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  • kingme34 Dec 08, 2008

    When I turn the ac on, if the engine is at idol, it will actually drop my RPM's so low that it kills my engine. It is somewhat affected by turning the heat on but majorly affected by the AC blower. I can only use my AC if I am driving more than about 15 mph so the RPM's stay high.

    Also, I have an issue with the instrument panel occasionally. Without any known cause, I will occasionally turn my car on to find the gauges flickering and completely unresponsive. I will drive for a few miles while they flicker at the zero position and they will beep as if I just turned my key to the ignition position and they will all return to the proper positions.

    Any ideas?

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The "Tachometer" is the gauge that indicates the engine RPM. It is not unusual for the idling RPM to drop slightly when the air conditioner comes on. The air conditioner represents a fairly large load on the engine so when it starts, the RPM will drop slightly. When driving, you'll probably not even notice that the air conditioning is a load on the engine unless you're accelerating uphill, pulling a trailer or passing another vehicle while the vehicle is fully loaded. At idle, the Envoy's computer should detect the falling RPM and make adjustments in fuel delivery to bring the RPM back up.

In any case, it shouldn't be cause for alarm, unless the air conditioner is stalling the engine. If this is the case, you are probably in need of service. The issue of low cooling from the air conditioner while idling in gear (as is the case when stopped in traffic, etc.) is correctable free of charge at the dealership on certain vehicles as a result of a recall. Your dealer can tell you if your vehicle is affected or if there is other recall work pending on your vehicle based on the VIN.

I hope this helps!

Posted on Nov 04, 2009

  • Steve Nov 05, 2009

    I mentioned "recall" but that is incorrect - it is a "technical service bulletin" that the dealers get. Sorry for any confusion this may have caused..

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