Vecrazz

So as far as I know it’s the slider frame that has the leak. Unless it was a bad window seal job from the factory. The solid windows don’t leak. That being said after pulling the spoiler I would recommend doing this regardless. The yellow tabs have a thin seal and the stud that aligns the spoiler has that crappy foam that was soaked all the way. 3m rope seal is a great product that stays workable for years. I left my headliner down and flooded the roof and no leaks. Problem is the dealership will only repair what GM tells them. After one visit and reading what happens to your interior with the sloppiness I won’t ever go that route again

Leevon many thanks for your post. Took delivery on a 23 3500 I ordered back in August. To my surprise the rear slider leaked the first day It rained. After much research both on here and facebook. I came to the conclusion perhaps my dealer could fix this. New rear slider was installed by a glass company and the mechanics made a mess of the interior and scratched some of my clear coat. Don’t know why I’m surprised. So next time it rained it leaked same spot between the glass and top plastic frame. It was then I decided your fix was the only way this could be solved. Thank you again for sharing we are leak free. I even did your 3m rope caulk.