Question about 2004 GMC Yukon

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2004 Yukon, air whether it's AC, heat or just vent doesn't go where the mode says it should. Mostly comes out the defrost ports on the dash. This is for both the driver, passenger and rear seat controls.

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This is probably due to a faulty blend door or blend door actuator. The blend door is a device inside the dash that directs the air flow to the desired vent. Sometimes they will fail, but usually is an actuator. Unfortunately, you will have to remove the dash to see if this is the problem. If you have never removed the dash on a Yukon, you are in for a very big job. Here is also some good information

Posted on Oct 15, 2010

  • jono1111 Oct 23, 2010

    Your problem is the mode door not the blend door. The blend door controlls the temp not not the vent selection. The mode door actuator is located on the drivers side of the hvac unit lay on the floor and look behind the accelerator and up. You eill see the blend door actuator and the white cog wheel that drives the mode door.

  • jono1111 Oct 23, 2010

    your problem is the mode door not the blend door. The blend door (there are two of them for dual zone climate control) controlls the air temp not the placement. The mode door actuator is located on the drivers side of the hvac unit. Lay on the floor, look behind the accelerator and up. You wikk see the actuator along with the white cog wheel that drives the door. By the way the blend door actuators are located above the left side of the transmission tunnel. Just remove the bottom cover. The one for the drivers side is right on the bottom of the hvac unit and can be easily removed. The passenger side actuator is located directly above the drivers side actuator but on top of the hvac unit. Luckily I have never had to replace the one for the passenger side. It could possibly be done by someone with small hands. Otherwise the dash would have to be removed.

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<!--[if !supportLists]-->4.Mode Door 2.
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