Question about 1999 Ford F150 Regular Cab

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Back sliding window leaks arond the seal onto the back seat, how can I stop this without replacing the whole unit?

I have a sliding back window that leaks, what can I do to stop the leaking instead of replacing the whole unit?

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  • Ned C Cook
    Ned C Cook May 11, 2010

    Try locacying the point of leakage. Is it from the tracks or the perimerimeter seal holding the window fram in?

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Gary, I had the same problem with my 1999 F150 xcab. I first ran water from a hose over the roof toward the back window. Start at one side and look for water trickles at the top of the window. Don't stop at one place but do the whole window. I found mine leaking at the upper corners and a small trickle at the slider window ends.
I removed my headliner to gain access to the nuts that hold in the window. There are two sets of nuts, one set for the windows molding outside and the other for the window itself. The factory seal was shrinking on the upper corners allowing the water to pour in. The window had to be removed. If you take off the nuts slide a utility knife between the body metal and the window frame, it will release. Be careful not to push too hard on the glass when removing (it may crack the frame and / or the glass itself) just use a steady push and make sure you cut the seal well with your knife.
After you have the window out, clean off the old seal with a plastic scraper so as not to damage the window frame surface, then clean with rubbing alcohol. Do the same with the tucks cab metal where the window seals to the cab. Be sure NOT to scratch the paint. If you so you will need to touch it up before you reinstall the window. Check your window for stress cracks in the frame. You can seal them with the butyl tape you will get at the parts store. If you cna't seal the stress cracks you will have to replace the window. You can also seal sround the outer edge of the window frame between the glass and the inner edge of the window frame that mounts against the truck body. The butyl tape should work for that as well, it is self adhesive.
Go to your local autoparts store and get new sealing material (butyl tape 1/4" or smaller). It comes in a roll. Place the seal around the edge of the window frame, making sure the tape is on the outside edge of the studs, and place the window back in the opening. (hold the window in by opening the slider) and replace the nuts on the inside. Snuggly tighten the nuts starting from the closest to the centers and working your way to the outside corner nuts. Once you have the window reinstalled you can water test your window right away, the sealer is waterproof immediately. If the window is sealed you may reinstall the headliner and any panels you had to remove.

Posted on May 29, 2009

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