I have a Fordson Super Major tractor radiator with a very slight leak. The filler cap isn't on top of the radiator. It's on the end of a horizontal pipe about six inches long which protrudes from the back of the radiator. Where the horizontal pipe is joined to the radiator there is a very slight leak on the underside.
I'm wondering if I can fix this by soft soldering. I'm not sure if the radiator itself is soft soldered or brazed. It's a copper radiator. Does anyone know what's most likely?
Now I'm not sure if this is a good idea. Am I likely to be able to fix this by soft soldering, or do I risk destroying the radiator?
And if people think it is a good idea, am I better to remove the radiator and drain it completely (the advantages being that I can clean off the oxide more thoroughly and work in a horizontal position) or am I better to drain out just a little water until the level is below the joint, and solder it in place (the advantages being that the remaining water protects the radiator from the heat, and that it's a lot less work)?
What's the best kind of flux to use?
Any suggestions would be appreciated.