[Jim Dewar]

Thanks Dave, I either have some strange electrolysis or radiator shock from temperature surges which I certainly have. The new and old radiator failed in the same way, where the core meets the epoxy ends at the tank, leaks around the core tubes. The unstable temps can't be good and you are proof of that.

Thanks Fran, That is very generous!! I'll ship it UPS this week. You may be able to spot the cause of the failure at a glance and send me on the way to a solution.