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  •  » Water in the trunk

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    9/08/2020 11:41 AM  #1

    TremendousWand
    I FYI 24-7

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    Registered: 5/16/2013
    Posts: 657

    Water in the trunk

    1966 Mustang Coupe, 5.0 HO Swap, T5z

    I gave the car a good wash and polish for the first time in years after having finished most of the restoration.

    I noticed some water droplets on the rubber floor mats and the seats that I attribute to worn and chipped molding on the little vent windows.  I actually have the replacement trim, just haven't gotten around to it.

    When I popped the trunk I saw a good deal of water had seeped on the the carpet.  The trunk closes solid.  The trim around the trunk lid looks good and is appropriately placed.  Admittedly, the lines on the car are terrible but that's pretty standard for any classic mustang.   I don't have many intensions of driving in the rain but I do have the battery re-located to the trunk and don't want anymore rust than I already have.  

    How do you think the water got in there?  Is there a known weak point?  Obviously water has to run down so it must have seeped in from the lid but it all looks good.  Unless I'm driving in a hurricane I doubt I'll ever have that much water directly poured on the car.  I was thinking of wetting the car down again and  putting my kid in the trunk with my phone to take a video of where the water is coming from.  Don't think my wife will approve but I can't think of another way to see where the water is coming from. 

     

    9/08/2020 12:08 PM  #2

    Nos681
    Senior 24-7 FYI Addict

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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,336

    Re: Water in the trunk

    I would check the glass area.
    Rubber seal to glass, rubber seal to body, body rust in that area.

    Even a pin hole will leak water.
    Body sealer in corners around trunk seal.
    Trunk lock seal.
    Gas filler to body seal
    Tail light frame to body seal

    I’m assuming water is on top of the gas tank and surrounding area.
    You may still see water droplets.

    On the glass seal, start at the bottom and work your way up with a hose or cups of water to get idea where leak is located.  If it is the glass at all.

    Last edited by Nos681 (9/08/2020 12:12 PM)

     

    9/08/2020 1:30 PM  #3

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
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    Re: Water in the trunk

    The bottom corners of the back window or for that matter the complete seal is a common  place that water likes to enter the trunk.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    9/08/2020 7:29 PM  #4

    6sally6
    Hyper FYIFORD ADDICT

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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,855

    Re: Water in the trunk

    I get a sheet of paper and close the deck lid with the paper in the crack (DON!!! Don't say it!).....
    anywho, do that all around the perimeter and make sure you 'feel' the paper drag when you slide it out.
    6sal6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    9/09/2020 10:04 AM  #5

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,266

    Re: Water in the trunk

    6sally6 wrote:

    I get a sheet of paper and close the deck lid with the paper in the crack (DON!!! Don't say it!).....
    anywho, do that all around the perimeter and make sure you 'feel' the paper drag when you slide it out.
    6sal6

     
    Yep
    That’s the trick, except I use a dollar bill. 
    Like the others said, window seal is likely, especially if no sealer was used when installing it!  Or there is rust.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    9/09/2020 12:55 PM  #6

    TremendousWand
    I FYI 24-7

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    Registered: 5/16/2013
    Posts: 657

    Re: Water in the trunk

    MS wrote:

    6sally6 wrote:

    I get a sheet of paper and close the deck lid with the paper in the crack (DON!!! Don't say it!).....
    anywho, do that all around the perimeter and make sure you 'feel' the paper drag when you slide it out.
    6sal6

     
    Yep
    That’s the trick, except I use a dollar bill.
    Like the others said, window seal is likely, especially if no sealer was used when installing it! Or there is rust.

    Is it possible to maybe use a real thin bead of clear silicone where the glass and trim meet?  I noticed just a tiny bit of moisture where the headliner and the package tray meet so i'm thinking you're right.

    What's a decent fix to this that won't look terrible.  Replacing the rear glass is probably the right fix but not in the budget this year.
     

       •Thread Starter
     

    9/09/2020 1:07 PM  #7

    Nos681
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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,336

    Re: Water in the trunk

    I wouldn’t use silicone.

    Use 3m Strip Calk instead.
    Or duct seal in electrical section of hardware store.
    Or mastic electric seal tape...expensive.

    At least with these, you can clean them off in future if painting or welding.
    Paint won’t stick to silicone very well, it will come off.

     

    9/10/2020 10:46 AM  #8

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,652

    Re: Water in the trunk

    I've read that the roof joint to quarter panel overlap was not always done correctly at the factory where the roof joint should overlap the quarter panel joint.  With the quarter panel joint over the roof joint, any water running down this seam can seep into the car.  Without correcting this misplaced joint, the solution is to load it up with silicone, or something similar.  Just something to keep in mind.

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

     

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