Question about 2004 GMC Sierra
I believe there is a small motor with 2 springs in the below dash duct work, it may be right above the gas pedal (but I am not 100 % sure) it
contols where the air flows in the ducts. Some what of a damper affair. I have the same problem in my 95 Tahoe, it just seems to stick and often lets go after a few minutes. You may need to give it a little persuasion, but do it carefully because you may drop the two springs off and it may mean pulling the dash out. Lay on you back and locate the motoer and get a helper to move the setting from dash to foor to vent , but give about 45 seconds between each move give a little pull. WD 40 may help but just a liittle.
hope this may help Ron
Posted on Aug 06, 2010
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Posted on Jan 02, 2017
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