One last question. Another member stated:
"The problem is not with the heater core at all, and AFAIK any heater core from any vehicle will be in the same condition if you used that coolant they used. The problem was with the fluid they used in the vehicles manufactured before April 2008, it seems that fluid for some error was out of specs, lacking of some ingredients or anti-corrosive ingredients or God knows what!!! "
Did your vehicle fall into that build date category? Mine was built in September of 2008.
Thanks