I have an 03 sc and in the past year I put 2 heater cores in it and the fist one only lasted about 4 months and the second one just went bad and I can't use the air at all because there's steam/antifreeze that come out of the vents... What would cause them to keep leaking after a few months?

 

I seem to remember someone with a similar problem and there being an electrical charge in the coolant system suspected as the cause of this problem. Try searching this forum for the thread. Good luck!

 

06-21-19***HEATER CORE LEAKAGE AND ELECTROLYSIS (INFORMATION ONLY)