Dear I-man;

Replacing the tank (with new) is the last resort,unless it has been severly contaminated/damaged and NO other is available.

Generally speaking; It's cheaper to have it repaired or replace with a good used one. Usually a Radiator Shop can do this (check/flush) for under a $100 if you "carry in".

Here; We cannot see it to make further judgements.

Good luck. \:\)

John M., I.I. #3370

"There are no shortcuts to any place worth going". -Anon