Question about 1999 GMC Jimmy

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What causes wiper to go off windshield suddenly while in use?

I can manually move the wiper any way I want. No restriction on movement. Like gears broke.

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Wiper arms have a hole at the end that fits over the wiper drive shaft and is secured by a nut. If the nut is loose the arm will not move predictably or will not move at all when the motor is on. You will also be able to move it by hand. This nut and shaft are covered by a piece of trim that can be pried up. It pries from the edge opposite of the wiper arm.

Posted on Dec 06, 2014

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Windshield Wipers


They might well be!
Check under the hood / bonnet at the linkage connections.
Occasionally, the bolt / fixing can work free, allowing the motor to work as normal.
This does not transfer the motion to the wiper arms and you get the motor noise but no movement.
Depending on the car, it could be easy - or very difficult to access the linkages.

Hope this helps.

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