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Q:

rear windshield wiper seems out of sync - wants to rotate beyond normal on 2007 Jeep Grand Cherokee

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
happens all the time - can't use it
(1) Answer
Set wiper arm and motor in the parked, or off position, then tighten the nut at the base of the wiper ARM! It's most likely hidden under a plastic cover which can be lifted up or removed for access to this nut.

BOTH WIPER MOTOR AND WIPER ARM HAVE GOT TO BE IN THE PARKED/OFF POSITION BEFORE THGHTENING!!!