Reviews for GMC Sierra 2500 HD years:
2002 GMC Sierra 2500 HD Reviews and Owner Comments
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2002 GMC Sierra 2500 HDVisitor, Boyce, LA, January 22, 2012 20:05I started to here a pulsation noise behind my glove box area about every 30 seconds. With my hand I reached under and located the noise against the fire wall. I found a damper that was opening and closing back and fourth. Then found out I have a cabin air filter; changed them out with new ones. Thought that would be the problem, but I still have this damper wanting to pulse back and fourth from open to close. I pushed the damper with my hand a few times but it still wants to go from open to close. Is this some sort of a vacuum problem or maybe an electrical signal telling this damper to go back and fourth? I think this is a damper to bring in outside air into the truck cabin.