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I'm pretty sure it's a bad wiper motor, but I thought I'd ask first before I buy a motor and tear apart the dash to replace it, since it seems to be in there.
On my 85 E350, the 2 speed (low/high) switch wiper motor only works on high, it never auto-returns to park, and sometimes gets stuck mid-wipe until wind hits it just right, or I reach out and help it.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.