Thread: Coolant issue
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      12-18-2023, 04:28 PM   #2
B21
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Drives: E89 Atacama Yellow 35is
Join Date: May 2022
Location: Scotland..God’s own country

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The water pump is a brushed unit…the brushes wear down over time..mostly use…as it’s an electromechanical affair as it heats up /cools etc it functions intermittently..

This failure mode is very common on N52 and N54s..I’ve personally not heard of it on a N20..but given your miles..

My 35is pump went the same way at 60k miles
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Much modified 2011 Atacama Yellow 35is…previously a much modified 2012 Atacama Yellow 20i MSport
Change history here… https://www.dropbox.com/s/8h1vabklgz...0List.pdf?dl=0
Build thread here… https://z4-forum.com/forum/viewtopic.php?t=131886
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