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Here's a video of my 2001 cab 996 window going down. Both windows do this. The rubber folds inward as the windows go down. Is this normal? Then at the end, the window kind of bottoms out, making a thud, as the rubber stops resisting the glass. Would be nice if it didn't do this! Ideas?

IMG_1326.MOV

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I can't see the video link but the rubbers fold in on my 1999 C2 coupe as described..

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I don't think that's normal. My driver's side window did that for a little bit. I remembered that I'd accidentally spilled something semi-gooey on the outside of the window, maybe a couple drops of a soda or something.

So, when I rolled the window up, I thoroughly cleaned the window, as well as the black rubber below it with a moist rag. I actually ran the rag between the window and the rubber (using a dull knife or something to put the rag in there). Now, my window behaves as expected.

I can't imagine that the rubber folding under the window for a long time can be good for the window regulator. Those things are expensive to fix, so you may want to try the same method I used.

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Treat the glass outside surface with liquid car polish as "Simoniz" or similar product when the window is fully closed, it makes the glass surface slippery as ice, now the surface is too rough and takes the seal downwards.

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It's definitely a case of too much friction, with the solution being along the lines of what RFM describes.

If you look at the video closely, you can see that the seal starts to get pulled into the window glass at the middle of the seal and then it pulls the rest of the outlying edges of the seal in. That middle is where there is the most friction.

Similarly, at the end of the video, you can see the middle of the seal releasing and then it starts to "unfold" out gradually towards the sides.

Gummipflege, which I think is a BMW-endorsed product or a similar product made by Sonax, here: http://www.sonax.de/Autopflege/Produkte/Felge-Reifen-Gummi/(so)/6/(node)/12977/340200-SONAX-GummiPfleger

don't attack rubber and are worth a shot to solve the friction of rubber on glass issue. You'll also get the (advertised) benefit of extending the life of the rubber seal and improving its appearance.

Regards, Maurice.

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Had the same problem with my car. I actually clay barred and waxed the window, that seemed to do the trick. The rubber strip still gets pulled down in the channel if I park my car in the sun. BTW, take care of it soon, I let mine go for a while and I ended up blowing out my reugulator :(

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I would also add that if you have ever had work done inside the door panels (e.g. aftermarket speakers) there may be additional points of friction in the panel either because of a larger size speaker that was fitted or because the panels weren't replaced properly and might be pushing the window to the outside of the door.

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