this happened to my car and what a pain. i shittt you not my car was in the shop 13 times before they(not the ford guys) got it fixed. they had to create a dam around the cabin air filter in order to keep the water from coming in. depending on how my car was parked the water would measure 1-3 inches with a hard rain. i ended up having my dad spray my car with a water hose while i was in the car to see where the water was coming from. good luck!
