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Aux water pump is right down there. If it threw a blade or bearing blew it could sound like that.
I had to jump start yesterday and could hear the pump clear as day key on engine off. I got back into the car before I noticed if the pump shut off over time if I didn't start.
Find the pump and unplug it will give you definitive answer.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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