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Interesting. Usually, the blower starts making a lot of noise before it fails like that. The bearings dry up and burn out.
You could take the blower out of the car and bench test it with 12V. Or let it run on high speed for about 15 minutes and see if it starts to slow down, which means buy a new motor.
It only takes about 1 hour to replace the motor, once you figure how to get the electrical connectors off the case.
Make sure you also replace the cabin filter, if you haven't done so already.
Because winter is coming, it snowed here today, I suggest getting a new blower. Then you can play with the old one on the bench and have a possible backup?
Klaus
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Just driving a 1998 V70R :)
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