GM firewall water leaks

This video will help locate and fix a leak at the top of the cowl/firwall area that has not been addressed before in gm forums or in video.

[@MrRolandm510]

So I’m back to let you know our Yukon has gone through 3 car washes 4 rain storms and AMAZING thing. Everything is still dry and working PERFECTLY!!! I CAN NOT THANK YOU ENOUGH FOR YOUR THOROUGH VIDEO! this is the “FIX” that no one other than you has figured out! Chevy/ gmc should had you a check for 10 million dollars. I guarantee they are using new materials in the future cause of you finding the cause. I will be your first supporting person if you want to do a class action law suit for millions of people who have gone through this nightmare.

[@justinw5502]

Took the 30 minutes to fix in 2005 2500 HD. Checked with water hose and it rained the next day, passenger side dry as my mother in laws you know what. Great post.

[@Anonymous-it5jw]

2005 Yukon is what he is working on. GM changes the arrangement of these items from time to time, and from the GMC to the Chevy versions. Great job showing us the solution to this common problem. Thanks for taking the time to make this video!

[@wadepeikert6346]

I wish I would've found this video years ago!!!! I have been going crazy trying to figure this damn leak out. Well done sir, well done.

[@franklinyoung]

Hey I fixed mine's and when this storm came through Texas Saturday morning I was really went and check for damping my shit was dry .thank you pop's👍.had the suburban 06 z71 for 2 years I'm the second owner and I was tired of this beautiful truck with water on the floor

[@30Thousand]

Thank you sir!!! Almost identical problem/fix in my 2001 Lincoln Town Car as well. This leak in my 2004 Yukon is what has been leading my blower motors to begin failing, then drawing too many amps, then melting connectors, then buying new motors. You've made my day!!

[@lespaul3d]

Thank you Philip! Very generous of you to share your discovery. GM should be held responsible for not alerting owners, this is a widespread problem since the 1990's at least. Dampness breeds mold and illness. Of course GM only wants the vehicle to last 5 years so why perfect them?

[@MrRolandm510]

Thanks Philip! I have been dealing with this for about a year with a wet blower motor resister( about 5 of them ) just pulled the plastic piece out and the seal looked just like yours. Cleaned all areas and double bead of “ flex seal “ in the tube. Made sure it pushed out at every corner and side. Then used my finger to make sure there is a curved edge from over the top and an inch around the bottom to make sure there will be NO leak from this piece. Re-assembled with new resister and put it all back together. An hour ago it rained for 20 minutes, but there is supposed to be a big down fall of rain tonight in 3-ish-to5-ish range this morning. Hoping it is really bad just so I can run the Yukon and have it go through the paces of floor,mid,face,defrost,high,low and everything in-between. This would be the last thing since I have had everything else repaired that cost thousands, but I’m also thinking 110% positive that you have showed the cure to this problem from all the other people ( people with common sense and use at least part of there brain ) on here that have had the same issue. I will do a follow up message once it has rained bad and then I will send my wife ( my wife’s Yukon )through a drive through car wash to make sure NO WATER on floor or burning out the “front climate controls” via a/c blower motor resistor.

[@thelasttimeitried]

I just wanted to give you a huge thank you for posting this. I had a blower resistor module go bad on a 2004 avalanche and had thought it was moisture accumulation from a clogged condenser drain. After watching your video I looked where the intake cover should be, and it was COMPLETELY MISSING! The previous owner had evidently thrown it away when it was loose.

[@6066maddog]

Great video. My 2005 suburban was taking on water like the titanic when it rained. It would fill the passenger side and even soak all the way to the rear passenger floor area. When I finally removed my panel, there was no sealant at all at the top edge of it. I used a heat gun to get the factory foamy sealant off the panel and reinstalled it with silicone sealant. Real quick repair once you know where to look. Thanks

[@The1948Pan]

Thanks for posting this. I had the same problem on a 2005 2500 hd . I used 3M weather strip sealant. I found if you reach in threw the other hole you can remove covers clips without damage. Great info here people!

[@NoNameFish247]

Yes! Thank you for this video. Found multiple leaks in my 08 Sierra once I started looking but was still having front firewall water intrusion. This was a great place to get started tackling that. Thank you for taking the time to make a video. This was fantastic.

[@neooneZ1]

I was wondering where the water was coming from, now I know.... greatly appreciate your video.. will be fixing this today!!!

[@markpeters2986]

Thank you so much for this informative video! I've been frustrated for almost two years trying to figure out where the water on the passenger side floorboard was coming from. All I knew was that if I took out the Weathertech floor mat the carpet would dry. Put the Weathertech floor mat back in, carpet would get wet. For those of you experiencing this problem you must pull the carpet up and away to allow the jute carpet pad to dry first! I found it almost impossible to cut the jute out so I propped it up and let it dry naturally over several days. Instead of removing the plastic cover on top of the firewall as shown in this video (I didn't want to run the risk of damaging it) I simply cleaned all around it then applied a heavy bead of silicone around the edge, waited an hour then tested it by pouring water around it. I also went through the carwash and no more leaking! To see how to easily remove the wiper arms after removing the nut holding them in place, watch this video -

[@stanjenkins5358]

Thank you, just saved me a lot of trouble shooting trying to figure out why my carpet is wet after a car wash and heavy rain fall. carpet wet from top under glove box all the way to under the front seat. g.m. really needs to step up and recall some of there problems they have made for us.

[@brock300wsmwsm2]

Thanks a lot, my 09 pick up has been driving me crazy with this problem.

[@jorgem6261]

Just when I think that I've pluged everything so that water doesn't get in my truck, I find this! (Life saver)

[@tj3n1]

I have a 96 Sierra which continually received a drenched floor on the passenger side after rain. I removed the carpet and put a bucket in the floorboard which revealed the water to be coming in from under the glovebox. That's just below this panel you're discussing in this video. Thank you! Now I know what I need to do to fix this issue and hopefully reinstall my carpet after I've confirmed it's fixed.

[@frankievalentin533]

Finally a video for this. Same problem that drove me nuts for years!

[@FlemNmzzzz]

Thank you SIR!!!! I've been looking high and low for why I'm taking water into my blower motor recently.