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The water leak is actually cause by the fender to wiper cowl seam under the plastic wiper cowl panel. The inner fender well over laps the metal wiper cowl panel. You will need to seal the seam and then inspect the dash fuse box, the two large wiring bulk connectors on the back of the fuse box for corrosion and also inspect the GEM module mounted on the back of the fuse box. It is a very common problem on the F150s and Expeditions of this body style.