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Source of water in trunk

Discussion in 'Mondial' started by hnichols, Aug 6, 2025 at 10:44 PM.

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  1. hnichols

    hnichols Karting

    Apr 15, 2020
    213
    Chicago IL
    Full Name:
    Hugh Nicholson
    #1 hnichols, Aug 6, 2025 at 10:44 PM
  2. FamilyCar

    FamilyCar Formula Junior
    Rossa Subscribed

    Sep 26, 2007
    789
    Seattle, Wa
    Full Name:
    Peter Goodall
    #2 FamilyCar, Aug 7, 2025 at 1:05 AM
    In the rear corner? I’m pretty sure there are no nearby hoses. It looks like you were washing it—a previously unnoticed leak from the lid seems most likely. Or the side marker light— assuming it’s a US car.
     
  3. Oleino

    Oleino Rookie

    Feb 2, 2023
    25
    Finland
    Full Name:
    O. Leino
    #3 Oleino, Aug 7, 2025 at 2:15 AM
    I had a leak from trunk lid Ferrari lettering, and from tail light seals. I recommend to check these. Put some paper on suspected leak locations before you wash the car and see if it gets wet.

    Also take out the trunk lining, foam and all other insulation. There may be some rust to be found if the leak has been there for unknown time. Don't ask me why I know this.
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    energy88 likes this.
  4. hnichols

    hnichols Karting

    Apr 15, 2020
    213
    Chicago IL
    Full Name:
    Hugh Nicholson
    #4 hnichols, Aug 7, 2025 at 9:08 AM
    Yes, it's a US car with side markers. But it's been dry. So I'm inclined to doubt an external source.
     
  5. hnichols

    hnichols Karting

    Apr 15, 2020
    213
    Chicago IL
    Full Name:
    Hugh Nicholson
    #5 hnichols, Aug 7, 2025 at 9:12 AM
    Thanks! Yes, it doesn't take much moisture for that delicate Italian steel to corrode! That's why I'm investigating this!
    I did have body work done recently, in May: they replaced the rear bumper and had removed the taillights and the chrome horse from the rear panel. But the moisture appeared more recently, after a drive in bright sunshine. A mystery.
     
  6. gsfent

    gsfent Formula 3

    Nov 16, 2009
    1,103
    PB County, Florida
    Full Name:
    Jerry
    #6 gsfent, Aug 7, 2025 at 6:28 PM
    Trunk gasket worn in the corner where the water is coming in? Maybe add a little clear RTV sealant?

    Regards,
    Jerry
     
  7. Wingnut

    Wingnut Karting

    Feb 11, 2005
    156
    Corolla, NC
    #7 Wingnut, Aug 8, 2025 at 4:34 AM
    Those trunk hinges rust up inside, causing enough resistance to crack the sheet metal around them. Mine had a hairline crack near the left side hinge, allowing water to pool in the lower left corner of the trunk.
    SOLUTION: fix the hinge first . Drill a small hole in the hinge (center) and pump oil into it. Work the lid up and down until easy-peezy movement.
    NEXT: fix the crack. I used a little hardening goop out of a tube, painted when dry. NO MORE WATER IN THE TRUNK, 4 years now.
     
    ronfrohock likes this.

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