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Old 11-28-2012, 07:01 PM   #10
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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.

“The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed.”
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