C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

90 power window will not roll down

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Old Jan 24, 2017 | 03:33 PM
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Default 90 power window will not roll down

The power window was working for as long as I have had the car, until a few weeks ago when I realized that it would no longer roll down. All the window does now is make a loud grinding noise, is the problem the motor, actuator, or something worse? This is the driver's side door by the way.

Last edited by Ljense; Jan 24, 2017 at 03:46 PM. Reason: Forgot a detail
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Old Jan 24, 2017 | 06:16 PM
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Its USUALLY just the motor. Once you get into it you will know if the regulator is OK....

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Old Jan 24, 2017 | 06:37 PM
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Originally Posted by CCRed
Its USUALLY just the motor. Once you get into it you will know if the regulator is OK....

Welcome to the forum!
I've opened up the door panel many times before, how do I go about finding out if the regulator is ok? Once the panel is off.
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Old Jan 24, 2017 | 07:28 PM
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Originally Posted by Ljense
I've opened up the door panel many times before, how do I go about finding out if the regulator is ok? Once the panel is off.
Once you separate the motor from the regulator, you will be able to test independently.

You can test the motor by once removing it from the mounts, push the up/down button. With no resistance from the regulator, it should spin pretty freely. If not, you motor is jacked.

With the motor un attached, test your regulator by grabbing the glass and freely move it up and down in the channels with very little resistance. If there is resistance, you need to do some adjusting and lubricating.

Last edited by billschroeder5842; Jan 24, 2017 at 07:28 PM.
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