5th Gear Member
Join Date: May 2008
Location: San Francisco, CA
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i sorry to hear that... unfortunately, air pockets in bimmers are hard to bleed sometimes. Personally, i squeeze the hoses a few times during the bleedin process. It helps to purge the air out.
Your radiator must have the integrated reservoir. I'm not sure if you can separate radiator from the expansion tank. But the easiest way to know is: call your local dealer and ask if just the expansion reservoir is available as a part. If yes, then there's your answer.
From experience, the leak mostly occurs from the seal of you coolant level sensor(located underneath the reservoir). Have a look-see. It just might be that an o-ring seal is all you need :-)