Question about GMC Envoy XL
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
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
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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Posted on Jan 02, 2017
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
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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