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Old 11-29-2012, 08:16 AM   #4
Brinkley
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Join Date: Dec 2006
Location: asheville NC
Posts: 1,502
My Ride: 99 328i, 07 z4 3.0
I would say you have air in the heater core, probably as a result of a slow coolant leak. A through inspection of cooling system, should reveal the problem, but it's most likely a crack down the expansion tank.
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