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1995 Cadillac Fleetwood Brougham
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I have 5 B Bodies (4 9c1 and one Roadmaster). One is a New York car and the others are lifetime Texas area cars. All of them are either rotting out or starting to rust in the same location on the top left portion of the passenger floor pan.

Any specific reason this happens? It's not road salt. I want to treat and protect it from happening again but need to pinpoint the source of it.

The picture I'm attaching is from Roadmaster with literally 0 rust, not even surface rust under the floorpans yet it somehow rotted out in the same spot my other cars rust/rot out in as well.

Maybe a constant leak from the heater core or something? View attachment 202297
It's the "body boxes" that house the body mounts. They are right where the rear of the wheel well meets the firewall.

Why do you say the NY car isn't from road salt?
 

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1995 Cadillac Fleetwood Brougham
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2,648 Posts
It's the "body boxes" that house the body mounts. They are right where the rear of the wheel well meets the firewall.

Why do you say the NY car isn't from road salt?
I misunderstood the location OP was referring to. The body boxes are at the outside corners of the floor pan, not the inside near the trans tunnel as pictured.
 
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