HI,
I've just bought a 1998 V70 and that's exactly what my driver's side wiper motor is doing (why the driver's side where you need to remove lumps of other stuff to get at the motor?).
I just removed the blade for now...
I'm wondering whether there's a 'self-parking' switch inside which isn't open-circuiting properly, so it keeps nudging the wiper blade a little more. That being said, could it be an electrical fault within the motor body that's not enabling it to work properly, and not a matter of the gears being stripped (which I gather is what can cause this motor to fail)?
If you find an answer, do please post it! And if I do, I will.
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