Each vent motor, about $250 at the dealer, has internal stop sensors similar to the headlight wipers and tailgate wiper. I can only presume one of the stops is broken and the motor is trying to close/open the vent farther than it can. Eventually the motor will burn out.
The only way you can determine which motor it is, is to remove the glovebox an listen.
Unfortunately, VADIS is required to reprogram the ECC after the motor is replaced. This is true of all Volvos after 1995.
Sorry,
Klaus
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The more I learn, the more I forget. So why learn?
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