Question about GMC Envoy XL

3 Answers

Having problems with A/C.When I set the control to A/C and vent to blow out the front vents it will only come out the defrost vents and floor.Not out the front vents even though I set it to come out the front vents only.Wanted to know if this could be a problem with the control or would it be a problem in the box under the dash.Really not wanting to have to tear out the dash.Anyone delt with this problem before. Thanks

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  • fxrsmike Apr 11, 2011

    I should have added this is a 2005 GMC Envoy I don't think it's cable operated.

  • fxrsmike Apr 12, 2011

    Funny you should mention a battery,I just replaced my battery with a Sears Diehard.Like I stated before the defroster will blow cold as will the floor just not the dash vents.So I know the door that is supposed to open isn't.Just not sure if it's the switch or the box under the dash.Which I hope it's not the box cause the dash may have to come out to access the A/C box and I'm not real thrilled about that.If it's the switch I'm not sure how to check it short of putting in another one.Any Ideas ?

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I'm convinced that your problem is in the box under the dash. But, check first time if the A/C control unit works good. Anyway when you will repair the A/C system first time you will remove the A/C control unit. Then you need to check first the front vent actuator. If the front vent actuator works good the front vent air flap inside the box under the dash is stucked. You need to remove the dash in order to access the A/C box to fix it.

Posted on Apr 12, 2011

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Thanks for choosing FixYa and welcome to the site. If it is in the dash, it will need taken apart to fix. You have panels in there that might have closed. You want to make sure all your panels are open and make sure you can see them actually open. You could also take off your vents to inspect the shafts. You can then see exactly what air is going where. Just make sure all the panels and air shafts are clear. It could be the actual switch itself. You need to set it on another setting to see if air comes out the vents. If it does, it is probably the switch. If not, you have a panel door in the shaft closed somewhere or there is something blocking the air in the shaft.

Posted on Apr 11, 2011

  • Richard Hale
    Richard Hale Apr 11, 2011

    If that all checks out, you might have a bad actuator motor. I have known people to change their battery before and fix a problem like this as well.

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Hi, most cars have dampers/diverters that are cable or electric actuated. Older cars may be vacuum operated. Not sure what actuates in your own car. Either the selector switch is not switching or the cable is loose or broken. You could check fuses but I'm not sure you'll find any.

Posted on Apr 11, 2011

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SOURCE: dash vents not working

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

Posted on Jul 07, 2008

  • 37 Answers

SOURCE: Heat wont blow through heater or defroster vents

The door in the heater box is most likely stuck. It is located under the dash on the passenger side

Posted on Dec 06, 2008

  • 20 Answers

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Posted on Feb 23, 2009

  • 37 Answers

SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Posted on Mar 13, 2009

  • 1 Answer

SOURCE: Dash vents will not blow air. Defroster and floor vents blow fine.

Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

Posted on May 23, 2009

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