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Just received my Sinister coolant filter kit and reading the instructions state to attach hose to the heater core line. My heater core line has something attached (I am guessing a valve) to it with a vacume hose attached to it. The sinister kit can be t-ed onto either side of the "valve". Question is: does it matter which side of the "valve" with the vacume hose i tee into? Does cooant only flow though the heater core when the heat is being used in the truck? Thanks Moter is an 2003 6.0 Stroker