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Originally Posted by RandallNeighbour
Strawfordt: Window regulators in the 996 and 986 are evidently not made to the highest standards in the areas of durability. I've replaced my passenger side W/R, and I suspect a previous owner replaced the driver's side.
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Because of the glass drop feature during door openings and closings, the regulators typically see a lot of use. a normal front door system without the galss drop feature is designed for 25,000 full up and full down cycles. Other features of the vehicle tied to door opening and closing are requiring 100,000 + cycles before failure.
By the looking at the system design. I'd say that the part is manufactured by a best in class supplier. Too bad the class couldn't be better.
Tom