I have coolant leaking in my tank meaning a leak in in the heater core. I know it's gotta be cut open and the leak welded. But lm afraid if the core leaks once it may leak again. A new core from bane is $429. It's a stainless tube about 8 feet long. Probably much cheaper to have it fabricated or why not use copper. They were originally copper l think. Wondering if anyone may have experience with this problem.