The blower works fine but I'm getting any air thru the defroster vents. on 1995 Oldsmobile Cutlass Ciera

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I get air thru all other vents except the defroster vents.
(1) Answer
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It sounds like the defroster door is not working, most likely it is a defective defroster door actuator.

here are some shops:
Is this repair something that can be done at home? Or is it possible to get the defroster open and just keep it open?