As the window starts down or up does it tip so the top is no longer horizontal? The driver's window on our 1991 745 did just that. The window would not close at the top without a helping hand on the lower end. I installed a mechanism from a low miles parts car that I assumed would fix the problem but it didn't.
I ended up taking apart the door enough to get at the seal on the front side of the window. The window glass had to be removed to get at the full length of the seal. I pulled the seal out of it's channel. I cut a piece of cedar that was as wide as the channel and about 3/32" thick. I put the cedar in the full length of the channel and then pushed the seal back into place. In effect it made the window opening 3/32" smaller. With a closer fit to the glass it was prevented from tipping.
Randy
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Any twenty minute job is just a broken bolt away from a three day ordeal
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