Moonroof not closing completely

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Brymck

TYF Newbie
Joined
Mar 17, 2024
Posts
26
Reaction score
22
I have a 2010 GMC Yukon Denali we recently purchased and my wife and I went through the car wash last night and quickly found out that the power moonroof wasn't closing all the way. Any suggestions
 

wjburken

Elite Member
Supporting Member
Joined
Dec 26, 2017
Posts
10,314
Reaction score
29,539
Location
Eastern Iowa
Is it not traveling far enough or is the gasket worn out and just not sealing?

First thing I’d do is see if I can readjust the glass in the opening.

There are 2 or 3 screws on each side that attach the glass to the frame. If you loosen them, you can adjust the glass position and see if that helps. Just make sure the front edge is just slightly below the roof and the rear is just slightly proud of the roof, like the thickness of a business card.

You can get to the screws by popping off the accordion pieces. I can’t remember if you need to pull the inner trim piece off first. It’s been awhile since it had to get in there and that was to replace the gasket that goes around the glass.
 

Joseph Garcia

Elite Member
Supporting Member
Joined
Aug 2, 2018
Posts
10,307
Reaction score
14,928
Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.
 

Trey Hardy

Full Access Member
Joined
Jun 12, 2020
Posts
3,552
Reaction score
9,637
I have a 2010 GMC Yukon Denali we recently purchased and my wife and I went through the car wash last night and quickly found out that the power moonroof wasn't closing all the way. Any suggestions
My switch would come loose in my 07.
I pulled down that panel enough to get my fingers in there to the switch and wiggle the wire and it would work again could give it a shot before you dig too deep
 
OP
OP
B

Brymck

TYF Newbie
Joined
Mar 17, 2024
Posts
26
Reaction score
22
I believe it is traveling far enough based on measuring around the glass to body, but I'm thinking the seal might be the problem. It looks like it's rolled down in the front and back corners.
 

OR VietVet

GMT800 2005 Tahoe Z71
Navy Supporting Member
Joined
Oct 8, 2014
Posts
23,720
Reaction score
44,163
Location
Willamette Valley
Need to lube all seals, moon/sun roof, doors, liftgate and windows, at least every 2 years. There is a recommended lube listed in the owner's manual.

My moon/sun roof is something I wish I did not have. I worry about a leak coming in the future. I do not use it or care to use it. Is a weak spot, IMO. If I was to sell my 2005 Z71, that would be one of the reasons.
 

j91z28d1

Full Access Member
Joined
Feb 28, 2022
Posts
4,604
Reaction score
5,863
worth checking the drain isn't plugged up too. they all leak a little bit but designed to drain faster than they leak haha.

I wish I didn't have one as well, on the way home with it, I had the sun shade open very heavy rain on the interstate. felt around and could feel some water getting in. like oh great, looks like I'm fixing seals. but it's never given me any problem. the bit of wet never got out of the drain groove.
 

wjburken

Elite Member
Supporting Member
Joined
Dec 26, 2017
Posts
10,314
Reaction score
29,539
Location
Eastern Iowa
worth checking the drain isn't plugged up too. they all leak a little bit but designed to drain faster than they leak haha.

I wish I didn't have one as well, on the way home with it, I had the sun shade open very heavy rain on the interstate. felt around and could feel some water getting in. like oh great, looks like I'm fixing seals. but it's never given me any problem. the bit of wet never got out of the drain groove.
A length of string trimmer line works well to clean out the two drain lines.
 

Doubeleive

Wes
Supporting Member
Joined
Nov 7, 2017
Posts
30,545
Reaction score
47,992
Location
Stockton, Ca.
ya that lube is not cheap, not the good stuff anyway, I bought some last year this was like $50
the small 15ml bottle is $25 this 2oz bottle is like 4 of those
pfpe.jpg
 
Last edited:

j91z28d1

Full Access Member
Joined
Feb 28, 2022
Posts
4,604
Reaction score
5,863
ya that lube is not cheap, not the good stuff anyway, I bought some last year this was like $50
the small 15ml bottle is $25 this 2oz bottle is like 4 of those
View attachment 423917


gm parts sells some for the corvette targa tops too. it was dumb expensive for like 2oz bottle. but it worked and those cars are plagued with noisy and popping tops when you drive.
 
OP
OP
B

Brymck

TYF Newbie
Joined
Mar 17, 2024
Posts
26
Reaction score
22
Thank you all for the great advice. I also wish there wasn't a moonroof in this yukon. I never had water pouring over my head in any of my other cars that didn't have one lol
 

petethepug

Michael
Joined
May 4, 2016
Posts
3,788
Reaction score
4,356
Location
SoCal
I’ve gone deep into the metal sunroof to glass moonroof Resto on another vehicle. It’s a can of fried worms. I’m not familiar with GM’s sunroof mech but can tell you the best thing to lube a sunroof with is dielectric grease.
 

j91z28d1

Full Access Member
Joined
Feb 28, 2022
Posts
4,604
Reaction score
5,863
I'm not sure if you can find it anymore, but the oem stuff is pretty good for me. you put it on, let it soak in and then wipe off the excess. since I've been using it my 08 weather stripping feels better than some new gm's I've looked at. but I also have nothing to compare it too. I bought the car, the top drove me crazy and before I sold it, I tried this stuff and it worked.

other brands are probably good too
 

Attachments

  • PXL_20240318_015932776.jpg
    PXL_20240318_015932776.jpg
    192.1 KB · Views: 14

Doubeleive

Wes
Supporting Member
Joined
Nov 7, 2017
Posts
30,545
Reaction score
47,992
Location
Stockton, Ca.
I'm not sure if you can find it anymore, but the oem stuff is pretty good for me. you put it on, let it soak in and then wipe off the excess. since I've been using it my 08 weather stripping feels better than some new gm's I've looked at. but I also have nothing to compare it too. I bought the car, the top drove me crazy and before I sold it, I tried this stuff and it worked.

other brands are probably good too
the oem stuff is gpl-105 pfpe
 

Joseph Garcia

Elite Member
Supporting Member
Joined
Aug 2, 2018
Posts
10,307
Reaction score
14,928
Thank you all for the great advice. I also wish there wasn't a moonroof in this yukon. I never had water pouring over my head in any of my other cars that didn't have one lol
It is amazing how much water collects on the roof after a rain storm. One morning I pulled out of my driveway after a rain storm, and I opened my sun roof, since it was a nice sunny day. After leaving my driveway, the road slopes down and eventually comes to a stop sign. I slowed down for the stop sign, and a RIVER of water came streaming down on me and completely soaked me. :banghead:
 

Forum statistics

Threads
137,753
Posts
1,991,207
Members
102,740
Latest member
JeffK
Back
Top