I am failing to see how running the coolant / water mixture threw the heater core would cool it down. The heater core and the evaporater are seperated in the case.

I would use a independent cooling system for my turbo / supercharger. Utilize a extra reservior to hold the coolant and a extra pump to move the coolant threw a small radiator. Then it wont mix with the 212 degreee cooolant running threw your motor.

To the best of my knowledge the current cobras and lightening utilize this currently, I'll go look on some ford site's....