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PointedThree :  Vans, Trucks, SUVs and Other Forums : G-Class : Water in cab from heater box?

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Water in cab from heater box?
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Posted 1/14/2021 9:49 PM
AGuess
Elite Veteran


Date registered: Apr 2006
Location: Holly Springs NC
Vehicle(s): 93 500GE, 93 500GE, 2002 G500
Posts: 678
500
Water in cab from heater box?

Hi Everyone. I am chasing water inside the front floorboards.
I replaced the wiper shafts, linkage and seals last year.

I am now thinking that rain water is entering the fresh air vent box under the hood and maybe the drain tubes are rotted and leaking water into the floor boards.

Has anyone ever accessed the drain tubes and replaced them?
If yes, how do I do that?

It’s water, not antifreeze entering the cab.
1993 500GE

Thank you.
Alex
#242377
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Posted 1/14/2021 10:25 PM
paulunm
Veteran


Date registered: Jan 2015
Location: Los Angeles
Vehicle(s): 2000 G500
Posts: 109
100
Re: Water in cab from heater box?

You sure it isn't the sunroof seal, door seal, door vapor barrier, or the rubber seal on the bottom of the side windows on the front doors?
#242378 - in reply to #242377
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Posted 1/14/2021 11:49 PM
AlanMcR
Expert




Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3492
2000
RE: Water in cab from heater box?

Verify that is the source first.  Put a slow running garden hose into the air intake.  See if all of it gets to the ground under the truck.
#242381 - in reply to #242377
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Author
Posted 1/15/2021 11:45 AM
Vehicross99
Veteran




Date registered: May 2009
Location: So Texas/SW Colorado
Vehicle(s): 2006 G500
Posts: 155
100
Re: Water in cab from heater box?

Hi Alex,
Another place you need to check is under the bottom of the windshield rubber seal.
If there has been voids in the sealant, water will collect and rust out the channel that the windshield sits in.
I had that happen on another vehicle. It rusts out the bottom of the windshield channel without you ever seeing it untill you start finding water on the floor boards.
I have a post about this in the DIY section. Sealing the rubber windshield strip.

http://www.pointedthree.com/disc/forums/showthread.asp?tid=16261&po...

Reg
#242384 - in reply to #242377
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Posted 1/15/2021 8:29 PM
AGuess
Elite Veteran


Date registered: Apr 2006
Location: Holly Springs NC
Vehicle(s): 93 500GE, 93 500GE, 2002 G500
Posts: 678
500
Re: Water in cab from heater box?

Thanks everyone. I replaced both door gaskets last night. I also closed the air intake flap and put a plastic bag over it. It’s raining today. I’ll see if I have water inside tomorrow. If not, I will put a slow running water hose in the air box and see if water comes into the floorboards. I changed he sunroof seal a few years ago. It could be the windshield gasket but I’ll check other things first. The water appears to be coming from the left top side of the center console and running across the floorboard. I’ll update when I figure this out.
Thanks
Alex
#242386 - in reply to #242377
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Posted 1/18/2021 3:15 PM
AlanMcR
Expert




Date registered: Apr 2006
Location: US, CA, Los Altos
Vehicle(s): G300DT E300DT 230SL
Posts: 3492
2000
RE: Water in cab from heater box?

Remember that the sunroof seal isn't there to keep out water.  Water gets past it pretty easily.  There are drains in the four corners of the sunroof mechanism that drain down the A & B pillar voids through tubes.  If those are plugged, you will often see headliner stains. 
#242391 - in reply to #242377
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Posted 1/29/2021 9:44 PM
AGuess
Elite Veteran


Date registered: Apr 2006
Location: Holly Springs NC
Vehicle(s): 93 500GE, 93 500GE, 2002 G500
Posts: 678
500
Re: Water in cab from heater box?

The water is coming in down the right outside foot well . The area where the speaker is located. The side panel of carpet is wet. I lifted the corner of the windshield gasket (outside) and water drained out. I’m going to pull the glove box liner and run a water hose over that corner of windshield and see if water comes in. Thanks for all of your insights and help.
Any additional thoughts are welcomed.
Alex
#242424 - in reply to #242378
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Posted 2/21/2021 8:53 PM
AGuess
Elite Veteran


Date registered: Apr 2006
Location: Holly Springs NC
Vehicle(s): 93 500GE, 93 500GE, 2002 G500
Posts: 678
500
Answer to problem

Hi everyone
This turned out to be the windshield gasket leaking at the right front lower corner.
When I removed the glove box liner and ran water over the windshield, water would deep in and run down the inside of the firewall. This might have also caused a problem with my EZ control
Unit.

I purchased a new factory gasket, had the windshield removed. I found the beginning of rust in two places on the lower frame, surface rust. Sanded that off, primed the frame. Then when the windshield was reinstalled the frame had glazing putty and a non hardening sealant bead run around the inside of the frame.

I hope this is the end of that problem for many years. The windshield gasket was replaced 10 years ago when the G was repainted. It does not appear that they used any sealant at that time.

Thanks for all of your input and help.
AGuess
#242503 - in reply to #242377
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Posted 2/22/2021 2:18 AM
Haraldhirmus
Member


Date registered: Jun 2017
Location: Estonia, Tartu
Vehicle(s): 2014 G350
Posts: 8

Re: Water in cab from heater box?

Hi,
windshield gasket seems to be a common cause for such kind of leak.
I had the same with my 1993 350GD.
Windshield was replaced but not the gasket - lot of water inside.

#242506 - in reply to #242503
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