Looked at a truck today, odd rust, thoughts

[dusten]

Any thoughts on causes of this? Prevention?

Looking at an 86 c20. It's got a spot of rust on one cab corner and the other might be rusting. Seems normal. Fenders and bed are good. Floors are good. But this is both odd and concerning

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[PrairieDrifter]

Mice possibly.

Does it have cab lights?

I would stay away from that kind of rust repair myself. Huge can of worms. Usually runs down the a-pillars and rusts them too.

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[dusten]

Mice possibly.

Does it have cab lights?

I would stay away from that kind of rust repair myself. Huge can of worms. Usually runs down the a-pillars and rusts them too.

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It doesn't. But that's my thoughts too. Whatever's causing water ingress might be all through the pillars.

Here's a few images from the ad

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[saltdog]

Drip rail leaks

 

[1STLS1]

When they are rusted that high, I usually think they have been around salt air and the coast. The red one was from Newport Beach CA and the whole cowl was toast. It had rust around the door jambs like you posted. The green and tan one was from Santa Barbara CA. Floors and rockers were mint in both trucks

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[dusten]

Drip rail leaks

Looking at the drip rails and the screws holding them, you're probably right

 

[Doppleganger]

After the last few years.....wonder if it was ever in a flood?

I remember looking at a car for someone about 10 yrs ago. Very clean but (heavier) rust in odd spots.....like the dash brackets, or inside the floor shifter bucket. Then I pulled the horn cap off and it was flaking-scaled rust inside and that was where I walked away.

 

[dusten]

After the last few years.....wonder if it was ever in a flood?

I remember looking at a car for someone about 10 yrs ago. Very clean but (heavier) rust in odd spots.....like the dash brackets, or inside the floor shifter bucket. Then I pulled the horn cap off and it was flaking-scaled rust inside and that was where I walked away.

We don't have floods here

 

[Doppleganger]

That doesnt mean it couldnt have at one time been someplace there was one.

 

[dusten]

From the history I have it's been here pretty much it's whole life. It's got no indications of being wet

That doesnt mean it couldnt have at one time been someplace there was one.

 

[edgephoto]

With that much rust it is basically a parts truck.

 

[dusten]

With that much rust it is basically a parts truck.

Lol I think you're looking at the wrong picture. Mines got no rust in the rockers floors, bed or fenders. The drip rails and one cab corner is it.

 

[saltdog]

Pull the rails, derust as needed and seal up with urethane.

 

[Grit dog]

It doesn't. But that's my thoughts too. Whatever's causing water ingress might be all through the pillars.

Here's a few images from the ad

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That truck looks familiar.
you’re right to be suspicious of that weird rust.
Look under the windshield and back window gaskets too.
it’s a crap shoot. At least he didn’t hide it.

 

[hoagster]

We don't have floods here

You get a lot of rain and if it sat outside all the time. I think @saltdog is right drip rail was my first thought.