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Old 01-20-2020, 11:42 PM   #81
Scooby Newbie
Member#: 181247
Join Date: May 2008
Chapter/Region: MWSOC
Location: Freeport, IL
2004 WRX Wagon


Originally Posted by Valarius Starchaser View Post
Thatís a coolant line

A lot of guys remove it never understood why no matter what climate your in what the gain is to doing it

To my recollection itís a cold start/emissions type system
I believe it's also to prevent the throttle from icing up in cold. Otherwise the pressure/temperature drop after the throttle plate could form ice and a sticking throttle.
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