The 4 screws that hold the vent cover in place also hold the assembly inside the door that has the heater motor and other items. The four screws go through the assembly inside the door, through the door and into 4 plastic legs on the vent cover. Two of the legs on the vent cover were broken and therefore the vent cover and the assembly inside the door were not being held tight against the door. The water was leaking in that area.