Ok the last place i had my car flushed didn't do it correctly and long story short my water pump rusted which resulted in my heater core shutting down and becoming corroded. My local dealership wanted 1500 to replace both. I bought both a new pump and core from an auto parts store. And have a Haynes guide. My question is this, Have any of you replaced either before. I have the ztech dual overhead cam. what do i need to look out for?