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Did you get a resolution?What a week, it poured rain on and off for days and it wasn't until one morning when I was getting items from my backseat I noticed it was soaked. The water is coming from inside the headliner and drips out either side right below the ceiling "air bag" plastic markers.
I pulled the upper tail-light and the gasket looked good and was "stuck" on there decently. I didn't see any residue behind it so I don't think it was leaking. I couldn't see anywhere to trace the leak back to visibly inside the headliner\roof, but the water was definitely INSIDE the headliner so I'm 100% sure it's not the sliding rear window seals. I also PAINSTAKINGLY pulled the sharkfin antenna to look under it as I feel like it is the most likely culprit. Let me tell you, it is possible to undo that antenna without dropping the headliner by going through the brake light access hole, but if you have big hands like mine it will be very painful. It took nearly 30mins of turning 1 click at a time with a 1\4drive rather and a shallow 10mm socket to get the damn bolt out of the antenna. My hands are swollen, cut, and bruised all along the tendons from this maneuver. The main reason I did it this way is I see "AIR BAG" marked all over the back, 2 on the ceiling, 2 on the B pillars, but I have no idea where those bombs are actually hiding and didn't want to risk setting them off pulling the liner.
After un-seating the antenna I didn't see water under it but I applied a bead of RTV around the hole it passes through anyways and then painstakingly tightened it back down. The 10mm bolt needed a ratchet the entire way on and off, it was impossible to turn by fingers. I also applied a skim of RTV to the tail light seal along the top and to the screws that hold it in "just in case". I covered it to prevent rain getting in while curing and it should be done curing by today. So a few questions come to mind...
1) Where are the airbags actually located in case this doesn't fix my problem and I need to drop the liner? I know I can disco the neg cable to theoretically "disarm" them but I still want to know where they are so they aren't set off with residual charge or damaged by me.
2) Has anyone found leaks like this and fixed it?
3) The black trim strips on the roof that run front to back on either side. Are they held down with glue? Are they "pressed" into a groove to hold them? They are the only other spot I can see that would potentially leak but I have no clue what they hide or how they are attached and I didn't want to butcher them by prying with a screwdriver.
Really hoping I already fixed the leak. It was a steady stream leak in heavy rain and I have no doubt it will destroy the back seat if left unchecked.