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Old 11-28-2012, 07:01 PM   #10
wildirish317
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Join Date: Sep 2012
Location: Louisville, KY
Posts: 2,692
My Ride: 2004 325Ci vert
My understanding, and experience, is that you bleed the system cold. I recently overhauled my cooling system and followed the Bentley manual procedure, which bleeds the system with a cool engine, ignition on (but engine off), temp set at highest setting and fan a lowest setting (but still on). You can hear the heater valve in the cooling system open. Then you open the bleed screw and fill the expansion tank until full.
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