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Old 11-08-2012, 12:04 PM   #2
vectorit
What?
 
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Join Date: Jun 2007
Location: Southern California
Posts: 7,617
Re: Heater fan only works while vehicle is in motion.

Could be that the bearing is going out on the fan, and the fan gets stuck on the box keeping it from moving. Then the vibration and movement of the truck while driving shakes it away from it's stuck position?

Either way, I would say pull it and inspect it and the box for junk.
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