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Thread: Loss of coolant
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Old 03-10-2013, 09:34 PM   #2
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Join Date: Feb 2008
Location: Arkansas
Posts: 407
My Ride: E46, E53, E90
Its Kind of hard to see from the video, but I think you are missing the blue screw cover on that. I believe that is the expansion tank overflow port that is used to "burp" the system when you do a flush. Look at the top screw that is used to let the system flow through the lower drain plug (video). Have you checked realoem.com for the PN?

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