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Old 11-11-2012, 01:32 PM   #3
dauble2k5
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Join Date: Jul 2009
Location: 46204
Posts: 354
My Ride: Facelift Coupe
It could be leaking from the bottom of the block. I did a cooling system overhaul a few months ago, and I want to say there was a bleed screw we had to remove to drain all coolant from the engine. If so, the crush washer may need to be replaced, but that's a bit of a task, just for one screw. You'll have to bleed the system entirely to replace one washer.

Check out step 9-12 for reference. http://www.bmw330ci.net/maintenance/completecoolant.php
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