You can try some drying silicone spray lube. Most of the time the control unit is faulty. I have replaced quite a few. Also, another trick is to have someone add a little resistance to the window and raise and lower it a few times, this will up the effort value in the control unit.
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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
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