E46Fanatics - View Single Post - Expansion tank Problem/Solution???
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Old 03-17-2010, 11:49 PM   #2
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Join Date: May 2004
Location: Bethlehem, PA
Posts: 918
My Ride: 2004 330i
2. When the engine overheats, it blows coolant out of the system. The first place it it runs to is that seam. It's a great shelf for coolant.
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