It is the dreaded window regulator.

The ones on the front are different from the rear window. Nevertheless, you'll probably need a new front window regulator.
There is a DIY article.....
http://www.xoutpost.com/articles/x5/e...nt-bmw-x5.html
Good luck.
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Originally Posted by tlecesne
Does any one have any experience with a 2001 X5 drivers window "coming off track" and not passing above the door when trying to close the window? I recently had the window regualtor replaced as the internal clip was broken at the rear. Now the same thing is happening again. Any suggestions?
tlecesne
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