5th Gear Member
Join Date: May 2008
Location: San Francisco, CA
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the weakness in window regulators(in practiaclly all cars) is the plastic runner that runs through the window regulators rails while your window moves up and down. They're made of plastic, and made to rub against metal rails.... (for the shooosh of operation) but they do break into pieces over time. on some models, u can replace just the plastic pieces, and on some models, they are riveted in place.
Depending on how creative u are(as these plastic pieces are available on eBay) u can choose to just replace the plastic OR..... "dread", bear the cost of replacing the whole regulator.
i.e. on BMW, Benz & Ford.. the regulator costs an average $200, but u can buy the plastic runners on eBay for $4.-(plus shipping) knock out/grind out the rivets from the old regulator, replace and then rivet the new one's.... and then re-install.