Question about 2005 Pontiac Sunfire

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Top vent on the dash does not work on my o4 sunfire

The vent system as a whole works well,only the top vent that defrost ur windshield does not work.The heat and air work have no issues.the car warms up but the window does not defrost.

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  • gweaver19 Dec 16, 2008

    My defrost is not working either the vents only work.

    Gregg

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It sound like its one of two things 1 it could be the function control knob on the dash is no good or that the vent/ def. door control motor is no good possibly seized up. the second thong that I would suspect is that the door itself is jammed in the on spot

Posted on Jan 10, 2009

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a.This door regulates air flow to either the dash vents or defrost/floor. If you have air flowing only through the vents with no defrost or floor, this door is failing. From our experience, this door is usually the first domino to fail. Not sure why, just is.
<!--[if !supportLists]-->4.Mode Door 2.
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1 Answer

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