Vibration only when radiator fans are on..
2013 F-150 FX4 - My friend of mine went "mudding" and ended up going through some really deep, like over the hood, wet mud. Truck made it through no problem, and made it home without issues. Afterwards he washed all the mud and crud out of the wheel wells, and under the hood, etc. All was fine until the cooling fans kicked on... only when the fans are on, there's a vibration that can be felt inside the cabin. He's going to take it in for the dealer to check out, but I was wondering if any of you have run into something similar.