Question about 1996 Chevrolet Blazer

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Insdie glovebox, a strange fan like, with paper hitting a small fan blade noise. doesn't happen continuoisly, but spuratic last could of days. their is a acess relay box in glove,, what is the relay acess box for? should i be worried?

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Anything been up on the dash that could have been sucked into the vents?

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Hope I can give you some direction. Speaking from a generic sense all ac/heaters these days have a door or doors in the blower box that control air flow from the main part of the box to different positions when you ask for vent, heater, mix, defrost etc..

Most these days are operated with a small electric servo/motor and unfortunately the mostly have plastic gears that wear and can "thump-thump" as the motor cycles trying to open or close the flapper door.

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