New answers tagged power-windows
It sounds like the regulator is worn out and will need to be replaced. I wouldn't try to force it up, or you could shatter the glass. The slides for the glass could also be at fault. Some windows incorporate both the slides and the regulator together ... some do not.
There are electronics (possibly integrated into the motor) that manages position and/or stall conditions (hitting travel limits). You should be safe installing the motor without, "clocking" the system.
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