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Old 10-25-2017, 10:37 AM   #79
John V
No more BMWs
 
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Join Date: Apr 2005
Carmudgeonly Ride: Ram, MS3, CX-5, RX-8
Location: Glenwood, MD
Posts: 14,753
If the expansion tank cracked I'd be worried about the thermostat housing. It's closer to the heat of the engine / exhaust and it appears to be the same plastic. The water pump is a no-brainer when you're there, as most of the work is removing the t-stat housing and draining / filling the system. The radiator has to come out on an E90 to get to this stuff. Really not liking the engineering of the newer BMWs
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