Alright, there doesn't seem to be a collective thread on the causes of our trunk leaks, and ways to prevent/ fix them altogether. A couple years ago my Cougar was rear ended by a pickup truck and it was fixed up pretty well. The only issue is I have some leaking up near where the trunk lid support arms attach to the body of the car. I think that the rear window seal is cracked and leaking, or maybe some body seams I'm not seeing. My trunk seals look fine to me, they are still supple and have no cracks or splits, so I don't think that's an issue.
If you have trunk leaks or any information to help fix them, feel free to post your heart out in here!
I used to work in a Toyota Manufacturing plant .. on the Body sealer line in the Passenger paint department, applying seam sealer and skiving corners.
Any hole ( we called them Pinholes because thats how small they usually were ) would cause a leak and flood the vehicle cabin - the plant simulated monsoon conditions in a special water booth to test for water leaks.
So .. typically, you'll be looking for a very small leak, or a crack in a seam where the seam sealer is applied - they didnt put very much on these Thunderbirds, they were brushed on, so If they didnt push it up into the seam, it could seperate later on down the road and cause leaks .. if you want to repair this you will need to remove the original sealer and re-apply it to the seam.
If your vehicle was previously repaired from rear end damage, it is possible that the seam may have been broken. If the body shop did not replace an entire metal panel, they would not repair any seams that could have been affected.
On my tbird here's where the leak is coming from .....
You can see the side closest to the fender the sealer is lifting. Pretty much all around it has lifted. It's not a bad leak, but if you get enough rain it will leak. It was worse when the leaves fell clogging up that area with tree gunk cause it held the moisture there instead of letting it drain out.
Checked these seams on my cougar, and they are indead split, very very small cracks but I guess water doesn't need much room to get in. I think I'll have to use a metal pick and just pull the old sealer out and use RTV as some of you suggested. We will see what happens I suppose!
For what it's worth, mine has started leaking again. The last time it happened, I cleaned out the quarter-to-trunk-panel seams and filled them with caulk. I then installed a rear strut tower brace from Rod (which is great, by the way) to help remove some of the body flex.
Once the temperature goes back up, I will clean out those seams and seal 'em up again. I also need to grind out the rockers and POR-15 the hell out of the rust.
Just a quick experience with headlight restoration.
I've thought about replacing the assemblies for quite some time, but pricing is a tad prohibitive at present, since there are more important things I need to do (shocks, springs...)
I did the sanding treatment a couple times...
Not sure this is where my inquiry belongs, but I couldn't find a better category!
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I have started my gradual LED conversion. I am converting all the interior light bulbs to led bulbs first. (not messing with glove box, ash trey, instrument cluster etc, just main lights)
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