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Definitive cab-area rain water leak thread

Discussion in '1st Gen Tundras (2000-2006)' started by shifty`, Jul 8, 2020.

  1. Jul 8, 2020 at 10:10 AM
    #1
    shifty`

    shifty` [OP] "that guy"

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    1st GEN CONTENT FOLLOWS!

    I was looking to see if anyone had a laundry-list of common fresh water or rain leaks for the Gen1 Tundras but couldn't find a sticky-able centralized source for all leaks to either pin or act as a main reference. I was hoping to go through and check a lot of these to work on proactively - leaks are inevitable, manufacturers rarely design cabins that are rain-proof for the long term.

    Since I was pulling the info on my own to start working through these on my '06, I thought I'd do something useful and create a go-to thread. This thread assumes you've checked for obvious stuff, like ... making sure the A/C condensate drain nipple in the engine bay on the passenger's side of the firewall is clear, you're sure this is not coolant, i.e. you're not smelling coolant in the puddle, and you checked some more-obvious sources like roof lights and sunroof drains being clogged (if you have one), sunroof seal.

    One tip to add if you're here and troubleshooting rainwater leaks: Classic "Duck" brand packing tape and a water hose is a GREAT combo to isolate a leak source. If you believe it's the 3rd brake light, try taping it over with clear packing tape, then hit it with a hose to see if it's still leaking. If not, it's probably another source - try taping across the top of the rear window seal now, and test again. If it's still there, maybe tape the roof rack rails from end-to-end and try again. Keep going until the leak stops. A few of us have used the tape trick to rule out possibles, and you can leave the tape on as long as you like. Turtle Wax's sticker and adhesive remover ($6-8/can at any parts store) easily and safely removes any tape residue.

    Clearly - and to the point of this thread - other members have found and fixed a few common sources of leaks. Here are the ones I could find, categorized with an explanation, with the most common solutions and part number where applicable and threads linked to it if you want more reading. If anyone has new things to add, I'm not anyone's boss, but it could be cool to add here. If you tag me in your reply, I'll insert your fix into this list when time permits

    :mudding:

    Cowl fasteners (all models) - The plastic fasteners holding the clips/screws for the black plastic cowl vent have a seal that breaks down over time. This usually manifests with water leaking onto the passenger floorboard. Toyota replacement p/n for the clips is 90080-18055 and can be ordered to replace the existing parts. To fix, you need to remove both wipers, remove the black plastic grille from the cowl via its screws/snaps, find the fastener clips, remove the original clips and clean out the old gasket material and either re-seal the factory with marine-grade sealant or replace the part entirely (OEM is $1-2/ea) . Related threads giving advice and showing the clips:

    https://www.tundras.com/threads/water-leak.50387/

    https://www.tundras.com/threads/dripping-into-the-cab.33888/

    https://www.tundras.com/threads/2004-toyota-tundra-water-leaks.28770/

    :mudding:

    Horizontal-sliding rear window (access cab models) - Drain hole for the slider can get clogged:

    https://www.tundras.com/threads/the-4-million-dollar-reinvestment-‘build’-a-chronological-story.46816/#post-1210451

    :mudding:

    General rear of cab/rear cab corners - First thing you'll be told to check is the 3rd brake light gasket or the horizontal sliding window seal if you have one, but it seems more often it's a drain at the top of the windshield where the black roof rack seals meet the rear window gasket. Pull the roof rack seal up/out where it meets the top of the rear window gasket, check for stuff to clean out, seal seems to be the winner here.

    https://www.tundras.com/threads/2004-toyota-tundra-water-leaks.28770/

    https://www.tundras.com/threads/doublecab-water-leak.36232/

    https://www.tundras.com/threads/wha...1st-gen-tundra-today.2558/page-86#post-916108

    :mudding:

    Windshield Leaks - Doesn't seem to be overly common, but with any vehicle more than 10 years old you may find rust on the sheetmetal which your windshield seals onto or one of the upper three seals (two corner seals, middle horizontal seal) go bad, leading to leaks. This may lead to drip on the dash, the front floorboards, soaking of the visors or headliner, or even weep out of A-pillar trim:

    https://www.tundras.com/threads/windshield-leak.22252/

    https://www.tundras.com/threads/water-leak-in-cab.35593/

    :mudding:

    Possible A-pillar leak source - Clips holding A-pillar trim in place could leak, would probably show up around the passenger or driver side kick panel. Something to look at if cowl fasteners aren't your problem:

    https://www.tundras.com/threads/the-4-million-dollar-reinvestment-‘build’-a-chronological-story.46816/#post-1210455


    Thanks to everyone who posted and-or helped in the threads up there ^^ Knowledge is power.
     
    Last edited: Aug 5, 2020
    lsaami, Darkness, e3phung and 4 others like this.
  2. Jul 8, 2020 at 10:47 AM
    #2
    bmf4069

    bmf4069 Yup, that's car parts in a dishwasher

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  3. Jul 8, 2020 at 11:00 AM
    #3
    Rex Kramer

    Rex Kramer 1-8-7-3-6-5-4-2

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    I noticed evidence of minute rainwater intrusion at the door right above both side mirrors, I traced down the point of entry and found weather stripping attached to the cab had flattened out over the years due to age & compression. The areas are circled in Blue. My solution was to treat the rubber weather stripping with ATP AT-205 Re-Seal, this treatment worked and I will periodically reapply ATP to prevent the seal from flattening in the future.





    InkedIMG_0343_LI.jpg
    InkedIMG_0342_LI.jpg
     
    Last edited: Jul 8, 2020
    shifty` [OP] and bmf4069 like this.
  4. Jul 8, 2020 at 11:14 AM
    #4
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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  5. Jul 8, 2020 at 11:16 AM
    #5
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Nice thread composition. This should be a sticky!
     
    shifty` [OP] likes this.
  6. Jul 8, 2020 at 12:07 PM
    #6
    shifty`

    shifty` [OP] "that guy"

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    Needs more hand!
     
  7. Jul 8, 2020 at 2:05 PM
    #7
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    Someday maybe. I posted a Scooter picture in the other thread.
     
  8. Aug 5, 2020 at 7:04 AM
    #8
    Hartsy8

    Hartsy8 Resident Hockey Guy

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    Anyone with a 3rd gen having any issues? Wanting to get ahead of potential leaks before wet season arrives
     
  9. Aug 5, 2020 at 8:18 AM
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    Darkness

    Darkness Allergic to white

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    It's really dark
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  10. Aug 5, 2020 at 9:16 AM
    #10
    ColoradoTJ

    ColoradoTJ O'Keefe Music Foundation Staff Member

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    This is good stuff. Done
     
  11. Aug 9, 2020 at 7:31 AM
    #11
    TX-TRD1stGEN

    TX-TRD1stGEN I'm not taking a knee

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    My rear window assembly was leaking through the upper driver's side corner. Went to a window place and they said the whole assembly would have to be replaced because it cannot be removed without breaking it.

    I was able to get it removed myself and reseal/reinstall. Doesn't leak anymore.

    IMG_20191110_110805.jpg
    IMG_20191110_110757.jpg
     
    bmf4069, shifty` [OP] and FirstGenVol like this.
  12. Aug 9, 2020 at 7:41 AM
    #12
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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    :yes:

    Good job! I love it when they say it can’t be done and you end up doing it with success!
     
    TX-TRD1stGEN likes this.
  13. Aug 25, 2020 at 3:13 PM
    #13
    Professional Hand Model

    Professional Hand Model A.K.A ‘Golden Hands’

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