I have an '82. At the bottom of the radiator, there's an elbow that takes a 45 degree turn and then connects to the lower hose for the engine. The line to the heater core is before the elbow. I have a leak right at that elbow joint. I can't tell if this is soldered, brazed or welded. I can solder and braze but welding is outside of my expertise. Does anyone have a suggestion for what method I should use to seal the hose?

 

It's brazed but can probably be fixed by soldering just like cooper water line.

 

Yup, super easy to fix copper radiators. I have pulled a few flues on my car and soldered them shut; it still keeps cool.