2016 Craz, 1st heater pump leaked after 2 yrs, under warranty. 2nd Heater pump is leaking this summer, I just replaced it. My friends have had the same issue with a Supra and a Tige, after only 4 yrs. As you may know these pumps run the entire time the engine is running. The Heater switch simply turns on the fan. I have thought of re wiring the pump with one of my unused spare toggle switches to run when I turn it on, along with the fan. The “heater core” is a small mini radiator and I don’t know how much it contributes to engine cooling? I’m thinking the only reason they wire it this way is that there must be some additional benefit to engine cooling? I know I could test it by cutting the wires to the pump and seeing how the engine temp reacts. Has anyone done this or had any experience trying re wiring? Thank you.