I live the in liquid sunshine of Vancouver. One day I get into the car and notice that the floor mat is wet. Upon futher examination I determine that the water egress is from the back drivers side door. The car is parked on a bit of a decline so the water first fills the back footwell and the moves up to the drivers footwell.
The dealership did a leak test and said that the body door seal was gone. So fine, I fork out $200Can for it and install it.
Next rainfall (next day!)same problem. My wife comes out to have a look and says "honey why is the door carpet (located at the bottom of the door beside the speaker) wet"? Good question.
Upon further examination I find out that when "watering the car" (strange looks from neighbors) the exterior horizontal bottom seal between the window and the door is goofed.
Am looking at changing all seals.

Hope this helps some wet person.

1994 850T Wagon 200000km