Power windows

  • 1999 GMC SIERRA
  • V8
  • 4WD
  • 250,000 MILES
What causes my power window to squeak when I push the close window button
Do you
have the same problem?
Sunday, August 28th, 2011 AT 6:36 PM

1 Reply

If it's a high-pitched screeching sound, check for sand or small rocks in the rubber seal at the top of the door / bottom of the window opening. You might see very fine scratches in the glass too going up and down. You can pull the rubber back by hand and run your finger over it to remove those rocks.

If it's coming from inside the door, the regulator might have a wire cable that runs on plastic pulleys. The engineers didn't understand, or didn't care, that those cables fray and come apart and the pulleys crack. You might be able to look down inside to see that when the window is rolled all the way down.

Look at the rubber channels the glass slides in. Normally they get real sluggish and take a long time to roll up when bug juice and other debris gets in there. To address that, spray both channels liberally with Silicone Spray Lube. The Chrysler dealer's parts department has that, and you can find it at most auto parts stores. I'm sure the GM dealers have it too, but it will be at a much higher cost. It sprays on like water, then evaporates and leaves a lot of "slippery" behind. Works real well for sluggish seat belts and for sliding rubber hoses onto metal pipes.
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Wednesday, August 31st, 2011 AT 4:17 AM

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