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Old 01-06-2013, 10:01 PM   #17
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Join Date: Jun 2012
Location: Peoples Republik of Massachusetts
Posts: 218
My Ride: 2005 325xi
Originally Posted by E46Mango View Post
Per BMW TIS, the bleed process is done with the engine off. The engine is not airlocked. Air will naturally find its way out with the engine off and thermostat closed.

Running the engine introduces the risk of an overheat while you're bleeding, heats up the expansion tank which increases the chance you'll damage the threads or the bleed screw when reinstalling it since the parts will have expanded. It also introduces the risk of injury due to hot coolant.

Do you have a link to this TIS, apparently thespaghetticoders link was removed by BMW?
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