GN2018 - I truly understand your concerns and was in your position last fall. I ordered a 21 and took delivery in December 2020. I ordered the truck being aware of the leaking slider issue, and because I liked the truck so much (and despised my 18 F150 so much) that it was worth the gamble. I also decided that if the slider became a continued issue I would pay the cost of swapping for a non-sliding window - and knew that was a possibility from the start. Ten days into ownership the rear slider started leaking. Dealer performed the TSB and sealed the slider top gap. It was good until mid February, where I notice a slight drip after days of rain. It was a small enough leak that the towel I have on the rear seat back wasn't wet to the touch. Once we had a warm day I put a layer of flowable silicone on the top of the window gap - see my post in this thread on 3/4/20 with details. We've had numerous days of rain since then with no leaks so far. As mentioned above if this continues to be a problem I'm going the solid window swap route, and will pay the cost out of pocket. For me I love the truck. The hassle of dealing with this, while not ideal and really pathetic, is worth it as overall I'm really happy with the truck. I wouldn't own another Ford due to the numerous issues I had with my 2018 F150. I feel like my GMC is superior in just about every way. As mentioned elsewhere in this thread it seems Ford and RAM trucks also have leaking sliders on some models. IMO the real issue is the crappy plastic window frames are mostly to blame. This is just my 2cents, and I hope this helps you.
I agree with what you are saying. Where the drip on the inside was located that is the lowest point, so I'm not exactly sure where the actual leak was coming from other than knowing it was somewhere along the top of the window frame. That is why I made multiple passes along the entire top of the window frame. This is why this thin runny silicone seems to be the solution. Sent from my Pixel 3a XL using Tapatalk
I had the TSB done at O'Neil GMC in Warminster. They used an outside glass specialist and they did a good job. I can't even tell the truck had been touched. I bought this truck at O'Neil, and I'm very happy with how they've treated me - both in sales and service. I attribute the slight leak (after the TSB) to the crappy window frame design.
TSB Sealing Repair Completed – UPDATE Quick background – Picked up my ’21 Sierra on 12/4/20. Within 10 days of ownership I had the leak on both sides at the top of the slider. Dealer completed the TSB, and I could see a heavy bead of the sealer that was laid across the top frame of the slider. After the TSB was done I didn’t see any leaks and continue to check very closely after every rain. I have a small towel sitting on top of the rear seat back rest just in case the slider starts leaking again. About a month ago during a steady rain I saw a drop of water from the same location - literally a few drips where it was barely leaking, but the towel on the seat back rest was dry to the touch as was the carpeting. As others in this thread have suggested and since it was barely leaking I decided to try the flowable silicone (permatex 81730) rather than have the truck torn apart again. When we had a warm day I cleaned the top of the slider as best I could and also taped off the top of the glass on the slider to try and minimize the mess. I used a full tube of the permatex and made a few passes across the top of the slider frame, being careful to not overfill the area. As other posters have mentioned that have used this product it is thin and runny, so being careful minimizes the clean up. Since using the flowable silicone 4 weeks ago we have had both snow and rain. Over the past week we have had significant rain, including long periods of drizzle, solid rain and heavy down pours. So far no leaks, so the effort was well worth it. I can see along the top of the slider frame where the flowable silicone has dried there is an even layer of silicone across the complete gap. It looks like the permatex product took care of any small gaps that the TSB work didn't completely seal. So far I’m really impressed with the permatex product and will use it again should I see a small leak in the future. Pic below of where it was leaking and also of the permatex product used. Thanks to everyone that recommended this product and the idea.
I've been thinking about doing something like this, as it makes sense to me to keep the water out of the spoiler gap and away from the top of the window. Have to try it. Thanks for posting the info and details - greatly appreciated. Sent from my Pixel 3a XL using Tapatalk
I had an 8spd in a canyon I owned. That 8 spd was awful. Hard shifts, hunting for gears and also had the reverse slipping/lag. Have the 10 spd in my sierra. Super smooth and is really a great combo with the 5.3. I'm very happy with the 10spd. Sent from my Pixel 3a XL using Tapatalk
I'm glad I'm aware of this. I'm going to be careful going through big puddles and road flooding. I'm also going to take a good look at the engine air intake under the hood. Sent from my Pixel 3a XL using Tapatalk
Most OnlineNewest Member
Who's Online 83 Members, 1 Anonymous, 2,839 Guests (See full list)
- Stand By
- Jeremy Combs
- Brian Lindsey
- Todd DeVaughn
- 15 Z71
- Cory Betancourt
- Matt Robertson
- James Beyer
- Earl Cordova
- Salsa De Piña
- Robby James
- Turd Ferguson