Could be enough flow to keep it cool at idle, but not enough to push into heater core?
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Matte Black Kidney Grilles | Smoked Tails & Corners | Mtech II Bumper | Hotchkis Springs | ACS Roof Spoiler | M3 Spoiler | 20% Tint
WTB: Black sun visors & grab handles - PM ME!
I have P.A. Soft and a 20-pin adapter. Only used it a few times but pm me if you need anything coded!