2020 GMC 3500 Rear Window Leaking

[mmey4]

Hi there,

 

We had a heavy rain and I noticed my rear window was leaking. I took off the rear spoiler to troubleshoot. It was leaking at both corners of the window. I ran a bead of silicone which seemed to help but it’s still leaking during heavy rains. Has anyone had this issue and was successful fixing it? 

[Another JR]

There have been other threads on this. Here’s one:

 

 

[UltimateToolReviews]

Your on the track, after you have the spoiler off, clean the channel with the window and cab really good, and just fill it up with flowable silicone, I used 2 full tubes from an auto parts store, it will never leak again.