no epoxy in this unit according to Ron Davis, 100% welded
That's good, epoxy sucks.
I have brazed before, fixed a AC condensor tube
Speaking of tubes, some are seamless and some are not. If the tube has a seam, too much heat will cause it to open up and leak. Then you have to cut that tube out too. I probably don't even have to say it but I will. Every time you cut out a tube you'll lose a little bit of the cooling capability of the rad, but seeing that the rads these things came were the bare minimum, you should be able to cut out a few and have no problem.
I see that new alumaweld brazing rod on TV does it work?
I've never used it. I've been out of radiator repair for about 8 years, so I'm not up to date on new products. When I was doing it though, I used plain aluminum rods (they looked like straightened out coat hangers), and flux out of a tub (it was almost like a dry paste, and I don't remember the name of it). When I did it, I would use the rod to scoop the flux out of the tub, then heat the glob of flux, when it started flowing I would apply the heat to the rod. Sometimes when plugging a hole in the header some of the brazing will drop into the tank. It's not a problem, just shake the rad around until it drops out of one of the connections, you don't want that in your cooling system.lol
Since your rad seems to have multiple leaks, you'll have to pressure test it after each repair. Once it stops "gushing" from the areas you are repairing, be sure to check for small "fizzers", those are the ones that sometimes take a few minutes to show up.
Just another little side note, if you notice that the area you have to torch on is turning white, remove the heat immediately, you're melting it. If you have a junk rad kicking around maybe you can practice with the heat on that first.
Also, I can't stress enough that the area has to be free of all contaminants...just a tiny speck of dirt will make your repair leak.
Glad I could help you out. I knew I'd be able to give you some useful info someday, after all you've given me a ton.
Spdrcer34, sorry that we kinda hijacked your thread.
EDIT: ALL OF MY ALUMINUM REPAIRS HAVE USED A TORCH WITH PROPANE & OXYGEN