Jump to content

Water leaks under the dash

Tony Alberts

By Tony Alberts
in Troubleshooting & Recalls

 Share

Recommended Posts

Tony Alberts New Member

Tony Alberts

Posted
Posted
I recently purchased a 2015 Chevy Silverado. The other day during heavy rain getting into the truck after it sat for awhile I noticed the interior windows were all fogged up. Didn't think anything about it, just turned on the AC for a bit to dry out the interior and the problem cleared up.


The next day again after a heavy rain I noticed about a cup of water on the driver side floor mat. The windows had been rolled up the doors fully closed. I noticed drops of water on the e-brake pedal, it appears the truck was leaking from somewhere under the dash.


I will be contacting the dealer on Monday but I'm curious if anyone else has noticed this problem.


I don't want my new truck to develope electrical issues or to start smelling moldy from a wet carpet.
  • Replies 46
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

POS VETT
POS VETT

I can almost bet money the water came through the leak at the multi-band antenna on the roof.

Z71 Blackout
Z71 Blackout

So here's a update. Under ther cowl there is a water diverter piece. Well on all the welds on the truck they use seem sealer. On the weld by this piece the seem sealer was put on and a extra piece rem

Posted Images

POS VETT Enthusiast

POS VETT

Posted
Posted

I can almost bet money the water came through the leak at the multi-band antenna on the roof.

  • Like 2
BuddyS Enthusiast

BuddyS

Posted
Posted

 

I recently purchased a 2015 Chevy Silverado. The other day during heavy rain getting into the truck after it sat for awhile I noticed the interior windows were all fogged up. Didn't think anything about it, just turned on the AC for a bit to dry out the interior and the problem cleared up.
The next day again after a heavy rain I noticed about a cup of water on the driver side floor mat. The windows had been rolled up the doors fully closed. I noticed drops of water on the e-brake pedal, it appears the truck was leaking from somewhere under the dash.
I will be contacting the dealer on Monday but I'm curious if anyone else has noticed this problem.
I don't want my new truck to develope electrical issues or to start smelling moldy from a wet carpet.

 

 

 

I can almost bet money the water came through the leak at the multi-band antenna on the roof.

I double what POS VETT said

 

Check this thread out: http://www.gm-trucks.com/forums/topic/158522-water-leak-in-the-roof/

 

I have been wondering if any 2015 would leak

 

Have you noticed the leak after a freeze?

BuddyS Enthusiast

BuddyS

Posted
Posted

Hello GM, but are we all going to have a stinky mildewed truck in a years time or will you decide to come out with an official fix for this and not a dealer patch with RTV??????

We are talking about ~$50k tuck and a ~$45 dallor part, really? I mean if it was designed correctly you can sell the part cheaper, R&D payback.

rocnrol Enthusiast

rocnrol

Posted
Posted

My two cents on this...... i had the exact same leak.... would get into the truck to see water in the floor mat, but the roof and pillars were dry. turned out to be grommet out of place on the fire wall. Haven't had a leak since.

pm26 Senior Enthusiast

pm26

Posted
Posted (edited)

My two cents on this...... i had the exact same leak.... would get into the truck to see water in the floor mat, but the roof and pillars were dry. turned out to be grommet out of place on the fire wall. Haven't had a leak since.

You are describing exactly what I experienced with my old 1985 Mercedes 300D. It leaked only once after a heavy rain, and it turned out to be a displaced hood release cable grommet on the firewall. When I sprayed some water on the windshield, I could see it dripping from the front cowl onto the grommet and flow into the grommet hole. After I pushed the grommet fully into place, no more water leaks. Sometimes it is the simplest problem that can be fixed in a minute or less.

Edited by pm26
scott19677 Senior Enthusiast

scott19677

Posted
Posted

Yes you will get mold. My 2007 had this problem. It took a few years to rear its ugly head. MOLD IS VERY DANGEROUS!!. I am very sensitive due to having Asthma. Kept getting cold symptoms. Never smelled anything for about two years. The dealer had to strip everything out. Then I traded it in. Im just saying do not take it lightly. Good luck.

BuddyS Enthusiast

BuddyS

Posted
Posted

 

I recently purchased a 2015 Chevy Silverado. The other day during heavy rain getting into the truck after it sat for awhile I noticed the interior windows were all fogged up. Didn't think anything about it, just turned on the AC for a bit to dry out the interior and the problem cleared up.
The next day again after a heavy rain I noticed about a cup of water on the driver side floor mat. The windows had been rolled up the doors fully closed. I noticed drops of water on the e-brake pedal, it appears the truck was leaking from somewhere under the dash.
I will be contacting the dealer on Monday but I'm curious if anyone else has noticed this problem.
I don't want my new truck to develope electrical issues or to start smelling moldy from a wet carpet.

 

Hi, I am curious if you have found out for sure where your leak is coming from. I have noticed that the 2015 models have a larger antenna as the 2014, may have something to do with the new onstar/wifi band???

So, I am wondering if these antennas leak as well.

  • 1 month later...
Z71 Blackout Enthusiast

Z71 Blackout

Posted
Posted

 

I purchased my new 2015 Silverado crew cab a month ago and has not been the best experience starting with the dealer the truck came from must have had a midget clean the snow off the roof with the snow rake leaving 15 yes 15 dents in the roof. Next off today went to vacuume out the truck and saw a puddle of water on the pass side against the kick panel. I took off all the trim and pulled back the carpet to reveal sm puddles under the carpet and insulation and the foam piece under the glove box. I am beside myself right now. This truck was $48,500 and this is what I get. It has just over 1k miles and have owned it for a month. This is my 7 th new Gm and will probably be my last.. Going to the dealer tomorrow can't wait to see what they say.

pm26 Senior Enthusiast

pm26

Posted
Posted

Hi, I am curious if you have found out for sure where your leak is coming from. I have noticed that the 2015 models have a larger antenna as the 2014, may have something to do with the new onstar/wifi band???

So, I am wondering if these antennas leak as well.

Who knows.

Z71 Blackout Enthusiast

Z71 Blackout

Posted
Posted

My two cents on this...... i had the exact same leak.... would get into the truck to see water in the floor mat, but the roof and pillars were dry. turned out to be grommet out of place on the fire wall. Haven't had a leak since.

I hope it's that easy. It's at the dealer now.

Z71 Blackout Enthusiast

Z71 Blackout

Posted
Posted

 

So here's a update. Under ther cowl there is a water diverter piece. Well on all the welds on the truck they use seem sealer. On the weld by this piece the seem sealer was put on and a extra piece remained as the robot or human that applies the seem sealer and stopped the application extra leaked out and was left on the cowl where the water diverter lays flush. Well because of the extra sealer under the water diverter it was not flush and the water ran under the diverter and down the firewall and in though where the wiring harness is on the passanger side. The had to move the fender out of the way to repair it correctly. The removed the extra sealer and made the water diverter flush then sealed the water diverter and re assembled what they removed. No more leaks and they dries out the carpet and insulation stuff and I get to pick it up tomorrow. We shall see how they did when I inspect it tomorrow. Thanks for the replies.

  • Like 1
  • 1 month later...
Collimare Enthusiast

Collimare

Posted
Posted

I also have a less than two week old 2015 2500HD Duramax LTZ Crew Short (last 8 of the VIN: FF558385). It has been raining the last two days here in Golden, CO so I pull the truck into the shop to install the new weather tech floor mats only to find standing water in the passenger floor board when removing the factory rubber mat. I jump in the truck and immediately take it to the dealer who vacuumed the water out and I left it airing out at the dealership. Hopefully they will find the problem quickly on Monday. I simply cannot believe it and am beyond disappointed!!!

 

I wonder how many more are out there with the same issue? I am just glad I found mine this quickly. With normal Colorado weather it could have gone undetected for a very long time had it not been for the steady rain and changing the floor mats. I would never ever think I needed to check the carpets for water. Guess I'll check every rain now.

 

Is there an official service bulletin yet?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • newdude
      Lower trims ( WT, Custom, Silverado ( aka LT )

      By newdude · Posted

      HD at the moment, are kinda their own deal.  How LTZ sells on those vs on 1500, there is a difference.   They are merging most of the mid trims on 1500.  LT, RST and LTZ are replaced by one trim, Silverado.  LT and RST are a BIG portion of sales.    Bad naming choice aside, the new Silverado trim will offer the spread of options that those three trims offered.  So expect to see things like the tech package for example, and memory seats.  And LT Trail Boss will now just be "Trail Boss" (formerly LT Trail Boss) but will offer content spread like the new Silverado trim will.  The press photos showed the Trail Boss (formerly LT Trail Boss) has access to Super Cruise now, which on the current truck was High Country only.       Here is the Trail Boss interior.  Memory seats and Super Cruise are present.  All things the LT Trail Boss it replaces, and the RST it was based on didn't get on the current gen.  You had to go to LTZ or ZR2 for memory seats, and High Country for Super Cruise.      
    • dennismc
      2021 vs 2026 handling (1500 X31 Sierra)

      By dennismc · Posted

      I installed a Hellwig rear sway bar on my 21 Sierra SLT, it made a huge difference on how the truck handles, no body roll, the trucks much more planted now. Not sure of the suspension differences between the 21 and 26,  if its body roll your having a sway bar will solve it. 
    • Old Bay
      frustrating P0446 code

      By Old Bay · Posted

      So a follow up and my fix. I found in online searches the live data to look at on a scan tool to verify the fuel tank pressure sensor was working.  It showed an spec number towards the lower end of the rang, but in spec.  Then while it was running opened the gas cap and the pressure should change.  It didn't change even a tiny bit.  The data for the purge valve said it was open...never changed. So then I measured the voltages on the plug for the fuel pressure sensor and they matched what it should be.  So local car quest parts had the sensor in stock...it was a bit of a pain to remove and an even bigger one to get it to actually go back in.  It helped to unbolt the driveshaft and bungie cord away from the gas tank to give a bit more room to work. So fuel tank pressure sensor in I cleared the code, and started it up.  I went to the scan tool's live data and... Eureka! The pressure number was different and fluctuated a bit.  So took it on a short drive and pressure number varied saw the purge valve go from closed to open and back to closed.  Drove it to and from work for roughly a week plugged in the scan tool no codes.  I took it in to get tested and passed.  In my state's infinite wisdom (oops meant greed), since I pushed the test with the maximum extensions I have to take it back in by Feb '27 to 'get it back up to date', then my next test won't be until Feb '29. 
    • newdude
      loose lug nuts

      By newdude · Posted

      Any grease on the stud threads of any kind?   Wheel studs should have NOTHING on them for proper torquing and so the nuts don't back off.     Are all of the mating surfaces clean?  So wheel, rotor and hub?     We've had plenty of trucks at work with that wheel, this is a first to me.  Makes me think they've got a lube tech putting anti-seize on all the wheel studs or some kind of grease, and they need to stop doing that.  To have 11 other trucks with the same exact problem.      
    • Flynlow
      2027 Chevrolet Silverado: Official Discussion

      By Flynlow · Posted

      I was a Chevy guy for years, then switched to GMC because I liked the looks better.  I'm actually thinking I like the Chevy looks better than GMC for the first time in a lot of years.   One thing I know for certain, the new GMC dash is hideous!  Chevy wins this one!  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...