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I recall a moment when my windshield wipers didn't work, but after I shut down and restarted they worked fine. Well, now they don't work at all. How should I go about a diagnosis to find the culprit. Is it highly likely that it is the motors, and I should just replace them? I can still use the wiper fluid, so I think the switch is still working properly. My Jeep has around 120,000 miles and is a '99 TJ. Is this a common problem with aging Jeeps?

-thanks
 

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Yes, I replaced mine last year. Take the metal grate off of the cowl so you can get to the windshield wiper motor. You can see most of the screws on top, but there are a couple you need to get by opening the hood and looking behind the rubber gasket. Take off the wiper arms, remove the metal grate and check for power at the motor. If there is power and the motor isn't going, it is probably bad. They rust and get water inside of them. It wasn't that hard to change, took maybe an hour taking my time.
 
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