Question about 2004 GMC Envoy

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My 2004 gmc envoy loses engine pressure when i have the air conditioner or the heater on. Also, the air conditioner will not blow out the dash vents but blows out the floor and defrost just fine. Autozone says i have a secondary air intake problem.

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  • mauriciommx Jul 10, 2010

    Did you find what the problem was. I'm experiencing exactly the same thing. Thanks

    mauriciommx@hotmail.com

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Don't know what you mean by engine losing pressure, but as far as the air not coming out of the correct vents, try the following;
Pull the HVAC-B (#36) fuse for 30 seconds (located in rear fuse panel, under seat), then put it back in. Then turn the ignition switch to RUN (no need to start the engine). Don't touch ANY controls for 90 seconds. I don't think it matters what position the controls are in, but some people think it works better if you have the HVAC system turned off. After 90 seconds, the actuators have gone through their paces, the controller has new memory data on the end stops of the rotation of each actuator, and you might be good to go

Posted on Sep 09, 2010

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