Quote:
Originally Posted by 5280VertDET
Its the vent flap. It's either broken or come off the mechanism that opens and closes it when you move the sliders on the HVAC. Real PITA... Good luck.
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^ This, I had the same on one of my S13s where the plastic ended up breaking off the arm the moved the flapper. You'll need to pull the dash to get at the box, I believe it's integrated with the blower motor housing.