Jump to content

The RennTech.org community is Member supported!  Please consider an ANNUAL donation to help keep this site operating.
Click here to Donate

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts

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?


Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

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.

  • Upvote 1
Link to post
Share on other sites
  • Moderators

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.

Link to post
Share on other sites

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.

Link to post
Share on other sites

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 :(

  • Upvote 1
Link to post
Share on other sites

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.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.