Hi Micmac
Sounds like window regulator gear binding so when you bang on door panel it puts everything in place.
Going up normally makes me think motor is good. The only way to know is pull door panel off and have a look. You will need a door handle clip removal tool any parts house will have.
Good luck let me know if you need more help
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Wednesday, September 10th, 2008 AT 10:37 AM