Moonroof not closing completely

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Brymck

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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

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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

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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

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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
 
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Brymck

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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

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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

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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

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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.
 

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