OK I know it's leaking the corners of my headliner are getting wet and the water is running down onto the seatbelts. It's an 07 GMC 4 door. Today is the first time I've noticed it but after really looking my headliner is stained so it's done it before. I can't find any reason for it to be leaking other than the plastic clip that holds the outer weatherstrip in place, that's just a hole in the body. Anyone else deal with this? Anyone have any ideas? Also what's under the strip that goes from the top of the cab to the rear window? Can that leak? Please help me before my truck gets ruined. Thanks

 

check your top brake light and see if it's leaking there.
silicone everywhere that you can imo

 

Do you have a sunroof? Ditch molding is what I think you are talking about.
We have guys called Water Doctors around here that do wind and water leaks. They are reasonably priced too. See if you can find someone like that to look at it.

 

3rd brake light

 

I was gonna say 3rd brake light as well. I had one to leak and it ran down to the seat belt.

 

Thank for the brake light tip, I never thought to look there as the water was on the sides. After removal it was wet in there and I can see on the headliner where it's been wet before. I sealed up the brake light and the two holes on the ditch molding so after everything dries I'll either hit it with a hose or if it rains tomorrow I'll know. Thanks alot guys.

 

Wow man that sucks, hope you fixed it!

 

Looks like that did the trick. I was out and about today and we had lots of hard rain with no wet headliner. That gasket isn't very substantual on the 3rd brake light. I used some gasket weatherstrip sealer and hopefully it won't leak again.

 

Great news bro, glad you got it handled.

 

What type of weatherstrip did you use. I have the same water spots too