Fighting the same issue. Test for the actual leak by 1) covering the wiper arm panel right in front of the windshield with plastic or the good painters tape and turn a hose on the windshield for a good couple minutes. If you have water on the inside floor, call Safelite and have the windshield redone. If no water inside, simply pour water from a bucket INTO the wiper arm panel, all across the width of the panel, then check the floors. If you have water inside, the drains that let water out of the fender bottoms right in front of both doors are clogged. Mostly on these trucks, the drivers side is clear because there is an access panel on that side behind the fuse box that can be removed to clear debris, and previous owners took care of this, being more apt to notice water on the driver side. There is no such access panel for the passenger side, and its very hard to determine if there's a wad of muck there blocking the drainage. That is my particular problem. Currently looking for that passenger side drain hole to run a fishtape thru to clear it, but darned if I can find it. Beginning to think Ford forgot to put the hole there!