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Old 02-03-2013, 12:55 PM   #6
wildirish317
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Join Date: Sep 2012
Location: Louisville, KY
Posts: 2,599
My Ride: 2004 325Ci vert
Not sure how you made out, but I would try flushing from the engine back to the water pump. The lower radiator hose would also be a "must check".

The primary passage from the water pump is into the cylinder head. You can pull the engine coolant temperature sensor (at the back of the head, below #6 intake port) and flush back from there. I haven't checked, but imagine this is a pita to get to.
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