Join Date: Sep 2009
Location: BC Canada
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I think it goes direct to the mode switch for your heater. Like bismic said, under vacuum, it closes and blocks the flow of hot coolant to your heater core.
2003 Ford F-350 King Ranch Crew Cab Short Box, 6.0L Powerstroke, DashDAQ, custom rear diff cover, DIY egr delete, air cleaner, fumoto drain valve, DIY coolant filter, JVC NX7000 Nav system Sirius/Bluetooth, remote start/alarm, spray in box liner, DIY Britebox and custom power feed, DIY High Idle, big HFCM drain plug,
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