91 v2500 pillar-roof seams and others

[enduroance]

Hey now,
I am nearing the end of what has been a very lengthy overhaul on my burb. Now that the mechanical repairs are (mostly) complete, I am moving on to sealing the cab up prior to installing a vapor barrier, insulation, flooring, and electrical components. I am hoping to end up with a relatively efficient vapor barrier in order to avoid condensation forming from heated cabin air contacting thermal bridges to outside air.

Down the road I am going to order all the body components that need replacing (rockers etc) but for now I am treating the rust to stop the spread, and sealing up seams that are leaking so the new materials don't end up with puddles underneath them

last night I started removing the seam sealant from the pillar seams at the roof. I dremeled them out. I am almost positive that the p.o. filled them all in with some form of white caulk as it has been running down and leaving deposits on the body panels since I got the truck.

I applied rustoleum rust converter in the seams, and was about to fill them with seamsealant when I noticed the drain/weep holes inside. Is there even a remote possibility that these seams are meant to remain open? Otherwise this hole would be filled in.

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Couple more trouble areas but I'll put them in as comments so I don't lose what I've typed so far. My phone **** the bed and I'm using my fire tablet which gets kinda quirky

 

[enduroance]

Next up is the water channel on the floor by the doors. These were full of so much caulk, seam seal, and mystery bondo garbage. Clearly this prevented them from draining properly. I removed a bunch of it and then applied the same rustoleum rust treatment. I know this stuff is not a permanent fix, as I'm not trying to put much time, effort, or money into rockers that are getting replaced.

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Generally speaking, is there supposed to be any sealant at all in these water drain channels? Or are they intended to be bare (painted) metal? The interior molding and trim pieces go on top of them of course. But on the metal itself in this groove

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[enduroance]

elsewhere, things are coming along nicely.
New heater core coming today. If you're replacing one, skip the aluminum ones. The spectra premium model specifically does not sit right in the box. Ordered another one from summit that is brass and copper with stellar reviews. Over the summer I had a small fire break out when my grinder sparks got into the original fire wall insulation inside the cab. Regrettably, I used a fire extinguisher. So I pulled everything to replace the insulation and clean the extinguisher powder that covered EVERYTHING.

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