I have a 2003 Honda Odyssey EX van and it does not have a sunroof. I have recently had a water leak that drips from the point where the head liner and plastic molding meet over the driver's side seat. It is not a large leak but is enough to make that spot of the headliner very wet and drip for a little while. I have only noticed this when it rains heavily or for an extended amount of time.
I took the van to the shop and they replaced the seal around the windshield thinking that would fix it. The next heavy rain that lasted all day caused it to leak again.
The shop is puzzled over what else could cause this issue. The shop has even tried to soak the windshield and roof with a water hose for over an hour and the leak did not reappear. What else could cause this type of water leak?