Leaky Windshield
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Cross-Country
Joined: Jun 2024
Posts: 95
Likes: 13
Leaky Windshield
I tracked down the leakage into my cab of my 1966 F100. Turns out the windshield is leaking around the gasket. It's a new windshield installed by the friend of an acquaintance and he has no clue how to fix it. So my question is... how do you fix a leaky windshield? It's leaking in about four places and the water is making its way to various places under the dash and dripping onto the floor. Thanks, rex
See A Man About A Horse
Joined: Apr 2003
Posts: 4,897
Likes: 651
From: Mariposa, Ca.
Pull the glass. New rubber seal. Not an el cheapo seal, one from Carpenter or Steele rubber products . Do the best clean up possible on the glass channel before reinstall. If all else fails, drop back 10 and punt.
Last edited by ibuzzard; Mar 25, 2026 at 06:07 PM.
Lead Gopher
Joined: Aug 2012
Posts: 10,014
Likes: 1,565
From: Seattle
Precision also makes good seals. But no matter who's quality seal there is one extra step to take to help seal the deal. The whole video is worth watching if you haven't done it before, but this should jump right to the most important part.
Tuned
Joined: Jan 2025
Posts: 449
Likes: 173
@TA455HO That was a great video, and useful for other cars and trucks too. Thanks for posting!!
@black33ford Hope the video helps and good luck with your project!! Please Let us know how you get along.
@black33ford Hope the video helps and good luck with your project!! Please Let us know how you get along.
Mountain Pass
Joined: May 2014
Posts: 187
Likes: 53
Well, this is on my top 10 to-do list for my 64. It’s a street dog so I always have to go out before the rain and put a tarp over the cab.
When I purchased it 11 years ago, it had a brand new windshield and a brand new seal. I’ve determined that it’s not leaking from the cowl area or the engine area. It’s that windshield seal.
There’s a guy in Southern California that is highly recommended and affordable. I found him on the Porsche 914 forums. He won’t do a job unless that channel has zero rust holes in it. When I finally get around to it, I’m gonna pull the windshield and check the channel out before I call him.
I’ll have somebody do all the necessary repairs and I’m gonna ask him to watch that video and I’ll probably get the precision seal.
This is a bit down the road-/ I’ll keep on putting the tarp on the truck. But it’s nice to know that I can finally end that frustration eventually.
When I purchased it 11 years ago, it had a brand new windshield and a brand new seal. I’ve determined that it’s not leaking from the cowl area or the engine area. It’s that windshield seal.
There’s a guy in Southern California that is highly recommended and affordable. I found him on the Porsche 914 forums. He won’t do a job unless that channel has zero rust holes in it. When I finally get around to it, I’m gonna pull the windshield and check the channel out before I call him.
I’ll have somebody do all the necessary repairs and I’m gonna ask him to watch that video and I’ll probably get the precision seal.
This is a bit down the road-/ I’ll keep on putting the tarp on the truck. But it’s nice to know that I can finally end that frustration eventually.
Thread Starter
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Cross-Country
Joined: Jun 2024
Posts: 95
Likes: 13
Thanks Sean. I feel your pain. My windshield and gasket is brand new. I don't think the installer sealed it as shown in the Precision video. I think I'm going to tackle the fix myself since I can't find professionals who will touch it.
Laughing Gas
Joined: Mar 2013
Posts: 769
Likes: 306
The original gaskets had sealer between the body and gasket, we use Dekaseal 8936 at our glass shop. Another issue is most new windshields are thinner than the original glass and don't fill up the groove in the gasket, so that can seam can leak.
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Mountain Pass
Joined: May 2014
Posts: 187
Likes: 53
Funny story. My daughter and I worked on an AMC pacer starting about two years ago. Didn’t know before I bought it that if you don’t have a windshield, you’re not getting one.
No one makes them, you put in the glass code to check all the shops and nobody has them people actually make them out of plexiglass.
For me, this was a safety issue for my daughter so I had to pay $2000 for the last NOS windshield on the planet from Ball’s antique glass.
At least we’re lucky we can buy aftermarket glass.
No one makes them, you put in the glass code to check all the shops and nobody has them people actually make them out of plexiglass.
For me, this was a safety issue for my daughter so I had to pay $2000 for the last NOS windshield on the planet from Ball’s antique glass.
At least we’re lucky we can buy aftermarket glass.
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