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Q:

How do you check the switch to see if is faulty or if its the motor. on 2000 Chevrolet Cavalier

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Will not close it stays in the down position.
(1) Answer
Are you speaking of the power window? Basically, either a test light or voltmeter must be used at the motor to check for power. If the motor gets power, and the window does not go up - then the motor is faulty. If the motor gets no power - back test to the switch to check it.