I guess the heater core for my ‘77 w/ AC is no longer available. Was wondering what you guys are doing for a replacement? Any info would be greatly appreciated! Thanks in advance.

I took mine to a radiator shop and they repaired leak. If it needs a recore, maybe they can do that? If not, I think glen-ray radiators does.

www.restorationradiators.com/

I am told that one from a 1994 Chevy Silverado 1500 is dam close and can be made to work if you open up one hole, Have not tried it yet, But I read it on one of the truck forums

I’ll check that out. Thanks!

Interesting, I’ll look into that. Thank you!

I've had them recored locally before.
For my 79 I bought one new at advance a few years ago and with discount it was around $40. Looked like the ebay one. It was non-ac. I don't remember what the AC ones look like anymore. I see you can't even get the normal one now.

I saw that on the Facebook Dodge Tin Grill forum. He just made one new hole, and everything fit great.

I used to have a 70 D200 with AC, and the heater core went bad in it. I tried to find one for it, with the same results as the OP. I took it out and took it to the place that did radiator work for me, and they ordered a new core,,,and just soldered my ends and pipes to it. Fit perfect and worked great.

Had mine rodded and resealed.

That's what she said!

The answer of take it to a radiator shop has been out there for a while. The part that surprises me is nobody ever says "where am I supposed to find one of those"? I mean, it's not like there's a lot of them left. Any way, this post made the DIY light go on: I know how to solder copper pipe in the context of doing minor residential repairs. How hard could it be to transfer those skills to this problem and leave the shop fees out of it?

^ That's why I wrote local rad shop, and if you don't have a good one send it off to Glen-ray. Who wants to do the job with some crappy chinese made one that you had to cut things up to make fit? And, it'll probably be leaking in a year!

Most of the heater core leaks I've seen were either on the core itself, or where the tubes connect to the core. If you have never soldered actual used heater cores or radiators before, I strongly suggest you practice on something that isn't very important. Fixing used heater cores and radiators that have had antifreeze run through them, and have been exposed to the elements for years is a different experience then soldering a copper pipe that you can easily clean. Then you need to devise a way to be able to leak test your work before, you have to assemble it into the box and reinstall it on the truck.

Years ago, the last time I took a heater core to a radiator shop, all they wanted to do was order a new one. According to them, their success rate at repairing old heater cores wasn't very high. This was an experienced radiator shop. There is no longer any radiator shop withing 40 miles of here, that I know of. I would be interested to know how much the suggested radiator shop charges for repairing a heater core, and I would like to know where they are getting a copper replacement core. Any new heater core I've seen in the last 3-4 years have all been aluminum. Gene

Yeah.....I see that I left the part out about the above took place in 1985 or 86! DOH!!

When I had mine done they had a couple catalogs that they ordered the core itself from. I think one was spectra premium. It was for a full size GM and even with it I couldn't find a new one. Or at least the ones you could get as replacements didn't fit and another was the universal kind that you can rotate the connections to the way you need them.. Thanks but I don't have trust in that not leaking. I've seen that black rubber dry and crack within a year.

That shop is gone but at least we have one left around here that does that kind of service.

i know a place that can make you a new core,you can either send them yours or tell them the size you need and solder the tanks on yourself,its different than working copper tubing big time
i had a shop for 37 yrs,early on you could get complete copper cores,later on aluminum completes only