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The motor is going to need replacing. I found a replacement on eBay and did it myself. You have to raise the gate and take off the rear panel to access it. I had to use my old bracket because the replacement models' was different but the motor mounted to my old bracket just fine. Just search Ford Expedition rear wiper motor on eBay. I got mine for about $50 new.

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โˆ™ 2011-09-13 17:54:48
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Q: What would cause rear wiper to sometimes not work on 1999 Ford Expedition?
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