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Old 05-02-2002, 01:33 PM   #4

Member#: 922
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
16 WRX (white)
04 FXT (red)


Because I believe that the heater core switch shuts off a valve to let coolant through when it's set to fully cold. Means if you have the heater on the coolest setting, it'll shut off all travel of coolant through the turbo. When you run in parallel it'll always be flowing through, even moreso when it's fully closed, but even when it's fully open. Errrr, did that make sense?
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