Question about 2003 GMC Yukon Denali

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Air is not coming out of the dashboard vents, however it is still coming out of the vent by the windshield

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The blend dorr is not functionging it is a mechanical or electric and is in the center of the consol look for it with a rod on it, remove the c clip that holds it on the door and move the door to see if it works if it does then check the switching vavle see if it is vachumed controled and if it is try replacing the control switch to make everything work. This is a common problem amoung cars.
avid101

Posted on Jul 16, 2009

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You need to open the dashboard ans check the passageway for the vents if there is any debris. You may also want to check the flaps, that controls the direction if they are in place. Check the passageway as well if there are opening that the air may go to.

Posted on Jul 16, 2009

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The cable inside the dashboard that allows you to control the flow of air might not be connected properly. bring it to a aircondition center and let them fix it for you.

Posted on Jul 16, 2009

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I may be able to help but, I need some more information. When you turned on your A/C what was the vent selector set at (Floor, Face, Defroster)?

Most newer cars with A/C systems have a built in setting when you set your vent selector to Defrost mode (blowing on the windshield) that automatically turns on the A/C unit. This is normal due to the fact that a fogged up windshield is from water vapor and the A/C does an awesome job of drying the air so it can more effectively and quickly remove that annoying water vapor from your windshield so you can see better while driving.

Try changing the vent selector to full face vent (the vents from the dashboard that you can adjust) and switch on/off the A/C and see if that solves your problem.

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The vent flap foam lining has come loose and needs to be removed or reglued . A spray on contact adhesive works best , don't glue the flap to the vent casing.

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This is caused by a loose of vacuum to the mode control switch, the vacuum line runs through the firewall on the passenger side near the kick pad trim.

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wow...here it is spring and no one answered either of you? Is there a large volume of air when fan is on high? Where is it going? Or do you not hear anything from the fan? The 240 has an awesome heater. On high it would heat a small home! If no sound, your blower motor is dead assuming the fuse is good. If you hear the fan blowing, figure out where the air IS going. Note that the only way to turn the dash vents off is with the white Oreo dials. To defrost, only that button should be pressed in and dash vents off. Behind the dash switches there is a maze of short vacuum hoses. Often times, people monkey w/ these and reconnect them incorrectly. Haynes manual or Chilton's have proper diagrams. It could be that the vacuum hose coming from the manifold and entering the firewall is split on the under side and not visible, also.

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