2021 3rd brake light replacement or spoiler removal?

[West1]

Anyone sound deaden the spoiler?
I need to put some sound deadener in my spoiler/3rd brake light and can’t seem to find a video on how to remove it. I tried searching the 3rd light replacement and don’t see videos or write ups on the 2021+ models yet.

When doing so like the previous gen Tahoes, the glass wants to come out as well. So before I go and remove stuff that’s not needed, I figured I’d ask.

What I did so far…
I removed all 11 T-27 screws and 3-4 nuts that connect the hinge to the spoiler. Then I noticed the entire glass moved w/the spoiler. Screwed everything back and ready to start at square one again.

Thanks!

 

[West1]

No one ay?

 

[Chad G 1979]

Why do you need to sound deaden the spoiler to begin with?

 

[StephenPT]

It’s an LED lamp, so they didn’t make it “serviceable.” On top of that, why are you putting sound deadening material in there? I notice no additional noise when riding in the third row of ours.

 

[West1]

I put a 15” sub in the trunk back in 2020 and tired of all the rattling. I’ve deadened the number, hatch and other areas that make noise. One of the last bits that sound pretty bad is the dreaded spoiler.

 

[Chad G 1979]

How do you hear the rattlling over a 15" sub from inside? Also it may not be the spoiler. It is possible that it is the glass rattling against the latch mechanism. There is quite a bit of play in the seal and the glass that it could be rattlling around.

 

[West1]

How do you hear the rattlling over a 15" sub from inside? Also it may not be the spoiler. It is possible that it is the glass rattling against the latch mechanism. There is quite a bit of play in the seal and the glass that it could be rattlling around.

When I park and go full tilt, I am able to locate rattling and confirm by giving pressure to the area in question. From the driver seat, I can hear it around 50% volume and as I go louder, it does get drowned out.
100% positive it’s the spoiler. The black plastic between the spoiler and the 3rd brake light rattles. There’s also black plastic between our doors & hatch that’s roughly 1/8” thick… I’ve had to deaden that on all 3 doors. Had to remove the rear bumper and add deadener where the bumper rest on the car body and the area that is basically in free air to thicken the bumper panels. Deaden my license plate…

Alcohol, deadener, Heat gun & 1” roller has been the answer to whatever rattling I can get to.

 

[Chad G 1979]

Ma6be you can dinf a way to get soray foam up into the spoiler area and that would help. Or you might have to remove the glass panel entirely to get to it. Not sure what else there is to need to get access to outside of wiper motor.

 

[West1]

Fellow member sent me this from his 2021 Yukon, I suppose it’s the same as the Tahoe! THANK YOU

 

[West1]

More

 

[West1]

5 pics at a time…
I know this will help someone some time!

 

[West1]

I Guess no one needs them, deleted

 

[StephenPT]

I Guess no one needs them, deleted

Why delete them? Maybe nobody has needed them within the last couple of weeks, but someone could do a search a year from now and they would find this thread - the pics would be helpful then...

 

[ryguy84]

Fellow member sent me this from his 2021 Yukon, I suppose it’s the same as the Tahoe! THANK YOU

Do you still have those pictures?

 

[West1]

1-5

 

[West1]

6-10

 

[West1]

11
Oops, I sent them out of order

 

[jgraves]

Thanks for posting the photos. I’ll likely be doing this (for aux reverse lights) in a couple months.

 

[West1]

Post pics of how you guys did it.
I still haven’t gotten around to sound deadening my spoiler Lol

 

[jgraves]

Post pics of how you guys did it.
I still haven’t gotten around to sound deadening my spoiler Lol

No photos (yet) but I started my aux reverse light install today. These images were very helpful.

Generally the rear spoiler was quite easy to remove. I didn't unplug the wiring and I disconnected the rear window washer hose from the nozzle. I only need the lower spoiler off and the upper spoiler loose. I currently have my lights mounted to the lower and partially wired together.

The most difficult step was 19, separating the upper and lower spoilers. I didn't break any clips but some are looking a bit rough. The clips are also part of the upper spoiler so there is not opportunity to replace them if they break.

For sound deadening, there should be no need to drop the headliner. I had it dropped to install cargo area lights and I will be installing a washer hose to the rear view camera.

Jeff