OK that elbow vents into a peripheral vent at the bottom of the tube. Mine was jammed solid, took 4 hours to loosen and remove all the gunk jammed in there.

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1988 325iC Project - RESTORATION FINISHED!!
Build Thread: http://www.r3vlimited.com/board/show...ht=325iC+paint
2001 X5 3.0 - 2001 M3Ci - 1988 325iC