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  1. #1

    Default Water Leak Front Passenger Floorboard

    When it rains hard, I get a small water leak on the front passenger floorboard. Any thoughts as to cause?

  2. #2


    Have you brought this to the attention of your local dealer? There are many benefits to taking a vehicle to your local dealership. You can guarantee that technicians are certified and that the parts come with a GM parts warranty. For these reasons, I would recommend taking the vehicle to your local dealership to be diagnosed. They should be able to assist you further and have a plan for addressing the issue. I can also look into this issue further. In order to do more research, I will need some more specific information from you such as your name, address, phone number, the VIN for the vehicle, and current mileage. If you have further questions, please feel free to contact me either on the thread or via private message. Thank you.

    Tricia, GM Customer Service.

  3. #3
    stephan's Avatar
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    Sep 2010
    Far West, Oregon USA,
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    Quote Originally Posted by Huntr View Post
    When it rains hard, I get a small water leak on the front passenger floorboard. Any thoughts as to cause?
    It could be a number of things, cowl drains, windshield seal, passenger door w strip, P door window seal.
    Water leaks can sometimes be difficult to diagnose, so Tricia may have the right idea on going to the dealer for this one.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
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    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  4. #4


    I had a similar problem with my current truck. took a while of having my dad run a house over the front of the truck and looking and finally found it. the culprit was the seal where the electronics run from the door to the cab (i will see if I can get a pic tonight). for some reason the waters path took it from the outside and ran right over that gromet and it was then filling up the space in the body. once that would fill it would flood the floor boards. easy fix. on the cab side I pulled the grommet/seal and put a whole lot of clear caulking in the groove of the grommet worked it back in and then made sure to caulk all the way around the outside edge of the grommet. No more wet floor boards and its been a few years. there could be other places but thats where I found mine. had to open the door when the water was flowing to see where it was getting in cuz I found the body panel that was filling first then had to find where it was getting in.
    Last edited by dsfloyd; 06-28-2011 at 04:33 PM.
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
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  5. #5


    Forgot to mention, it's dripping from behind the center of the glovebox. Coming from the heater core / blower motor housing area.

  6. #6


    hedging bet on heater core clogged and/or condensation in blower motor area from the ac....

  7. #7


    It seems to be coming from the condensate from the defrost cycle of the freon line for the AC system

  8. #8


    look at the fire wall on the passenger side. You should see a tube running down it. Put a stiff wire in the tube and clean it out. That is the drain for ac condensation. That model year is know for having a leak from the screws that hold down the cowl. You can try pulling them out and putting some silicon on the threads and reinstalling. Water leaks can be hard to find. Like a previous poster said, sometimes it takes pulling the dash apart and laying under there with a flashlight while someone soaks it down with a hose. I had an access panel under the cowl leaking on my yukon xl. the seal just vanished
    Last edited by Pikey; 10-19-2012 at 11:23 AM.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

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