Replaced Sunroof Seal - Still Leaking - Is It Trim Around Glass? (4 Viewers)

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Apr 26, 2020
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Knoxville, TN
Welp, spent a good chunk of yesterday taking the sunroof apart, removing the old seal, using a stripe wheel to remove the old adhesive, and installing a replacement seal with 3M weatherstrip sealant.

Not sure if I did something wrong with the sealant (putting in too much), but it wasn't absolutely 100% uniform around the edge. However, it did seal firmly around the edge of the roof when I reinstalled. (Had to help it seat down, which to me indicates a good seal as it is pushing against the edge of the roof body.)

We just had a rainstorm and I parked outside to test, and this is what I'm finding under the rear plastic trim cover. I pulled it off and it was full of water that looks to be originating here. That water works its way over to the passenger side and drips on the passenger seat....... just like it did before I replaced the seal. So maybe my seal wasn't actually bad? (Forehead slap)
IMG_8430.JPG


That hole is in the middle of the sunroof, dead center, but I'm not sure if the 'cut' in the trim above is factory or perhaps where the old glass trim has cracked? There is another one on the outside, which is why I assumed it was uniform/factory.

That being said, I believe that is where the water is originating -- the vertical line to the top right of the hole, then it is dripping down onto the metal hole/bracket area.

1. Did I install the seal incorrectly to cause this?
2. If not, does this indicate the actual trim around the glass is bad and that is what needs to be replaced? (Part # 63201-60063, $510.75 from Norwalk...)
3. Could I try slapping some 3m weatherstrip epoxy on that vertical line since I've already got it (and in an attempt to avoid spending $510.75+shipping on replacement glass)?
4. The sunroof does seem a bit lower on the rear side of the glass than the front. I'm not sure if they should be perfectly level from front to back or not. Could this be a problem with the sunroof mechanism itself? For example, the tilt function needs assistance when you go to push it back down -- you have to push down on the glass to get it to come back down.
5. Any other things to try before ordering new glass?
 
I didn’t read your whole post but if u replaced the rubber seal and it’s still leaking (like mine did), then yes it’s coming from between the glass and plastic trim. I just applied some clear silicon in between and all is good now.
 
I didn’t read your whole post but if u replaced the rubber seal and it’s still leaking (like mine did), then yes it’s coming from between the glass and plastic trim. I just applied some clear silicon in between and all is good now.
Did you apply all the way around or just on that seam? And on the underside of glass, on top, of both?
 
I applied it all the way around wherever glass and plastic touched as well as the seam on the plastic. Hope this helps you.
 
Check/unclog your 4 sunroof drains. The sunroof seal is not 100% waterproof.
 
Check/unclog your 4 sunroof drains. The sunroof seal is not 100% waterproof.
You did that to the best that I can, and have tested by pouring water in and watching it drain out bottom.

Nonetheless, I am fairly confident I confirmed the issue is between the glass and the rubberized plastic trim and not the actual seal. When spraying the top of the roof a drop appears and gets larger on that split seam in the photo, which drips into the plastic tray and, heads off to the passenger side, and then drips from there down onto the seat.

I feel like if it were the drains I'd be getting water not in the plastic tray, but more straight onto the headliner, etc.
 
Did you apply all the way around or just on that seam? And on the underside of glass, on top, of both?

I went through the same process you did by replacing the entire sunroof seal just to notice it was leaking exactly the same is it was before my repair..... I put some clear silicone completely around the plastic trim to glass seal around the sunroof and the leaks stopped completely. I can try to take some pics when I get home if you would like?
 
I went through the same process you did by replacing the entire sunroof seal just to notice it was leaking exactly the same is it was before my repair..... I put some clear silicone completely around the plastic trim to glass seal around the sunroof and the leaks stopped completely. I can try to take some pics when I get home if you would like?
Appreciate it. I just did a bead around the top myself. It isn't pretty but this isn't a show car. I just want my wife to not get soaked when riding in the truck. Need to let it sit for 24 hours before I test it. Probably more like 30 and I'll do it tomorrow evening after work.

None of the DIY sunroof repairs mentioned it, from what I remember. I looked at several threads, but perhaps that's because I was specifically searching the seal. Lesson learned to start simple (like @hoser mentioned) and test it before going all crazy ripping stuff out. I'm new to DIY car repair, so chalking this up to learning experience. Just hoping the silicone fixes it.
 
Toyota sunroofs don't really "seal". That's why they have drains. Water intrusion gets caught in the pan around the mechanism and goes out through the drains. If you are getting water inside, I'd make a safe bet it isn't the sunroof, but how the water is manged once it is already inside.
 
I can say from experience it leaked from the glass/plastic interface. Water did not make it to the “drip pan” but onto the headliner and down the a pillar which would never have reached the drains unfortunately.
 
Toyota sunroofs don't really "seal". That's why they have drains. Water intrusion gets caught in the pan around the mechanism and goes out through the drains. If you are getting water inside, I'd make a safe bet it isn't the sunroof, but how the water is manged once it is already inside.

I can 100% guarantee there are people getting a leak from the sunroof glass to hard plastic interface, including myself. Trust me, I went through the process of checking the drains before going through the trouble of purchasing and replacing the seal around the sunroof.

I don't know how else to fix this issue other than applying sealant to the plastic to glass connection around the sunroof. I am totally open to another solution if you have one though and would appreciate any other ways to fix the problem.
 
It appears that the theory is correct. Soaked the sunroof with the bead of silicone in place, no leak. Will have to do a longer test in an actual rain storm, but early results promising. Thanks for the advice, hoping I just saved $600!
 
It appears that the theory is correct. Soaked the sunroof with the bead of silicone in place, no leak. Will have to do a longer test in an actual rain storm, but early results promising. Thanks for the advice, hoping I just saved $600!

About to start on this myself. To clarify, you're talking about placing the silicone here on top in red, right? Not underneath?

Capture.PNG
 
you can make it look pretty clean by using tape. tape both sides where the silicone goes, then spread the silicone and smooth it best you can and take the tape off. I'll take a pic of mine some time. and don't forget to silicone where the plastic meets itself as well.
 
Just following up on this because I've got to sort the same issue myself: You can smooth the silicone with some denatured alcohol. Just make sure to use a latex glove or something, use your finger to smooth out the bead. And rinse it off afterward. Just from prior experience with silicone. Feel free to holler if theres a reason that won't work here.
 
I had this problem. On my truck the leak was at the point where it looks like there is a casting seam in the plastic. Look for it in the middle of the leading or trailing edge where the plastic surround meets the glass. A small dap of silicone at that spot solved my problem and is all but unnoticeable.
 

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