Question about 2004 GMC Envoy

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Dash vents not working

Floor vents and defrost vents work,but dash vents that blow on your face dont

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  • tvesely Jul 16, 2008

    I have the same exact problem! Let me know if you figure out how to fix it.

  • bobryan May 22, 2009

    dash vent will not blow out air others will they are open

  • Anonymous May 22, 2009

    constant heat on drivers side of vehicle

  • Jay Pravda
    Jay Pravda May 11, 2010

    GMC says its the a/c control unit and wants $450 for the part and $450 for labor to repair.

    Sounds extreme to me. What do you think out there?

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It may be the actuator not working properly. Should be above the accelerator pedal to the right.

Keeme

Posted on May 20, 2009

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I hate to question your intelligence, but are the vents open with the knob below them?

Posted on Jul 07, 2008

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1 Answer

I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


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The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

Cannot get any air from dash vents while defrost and floor vents work fine...

Your particular actuator will be a different one than they found.
They're all a absolute pain to get at because they can be well buried in the dash. I would start looking under the dash on the passenger side, that's where most of the air control is. Cannot get any air from dash vents while defrost and floor vents work fine...

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I think your problem is the head unit that selects where the air comes out ie. Face, floor, defrost, or hi-level face and floor. If that's not working then it will not let you switch location that you want the air to come out.

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