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      10-16-2012, 08:06 AM   #5
LiM3y
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Drives: 2008 E90 M3
Join Date: Jun 2009
Location: CT

Posts: 1,251
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Just had this issue. There is no sensor in the PS fluid reservoir I just found out (this was a surprise, I swear I get a code from the AC unit just when I fart!), so I let my reservoir run really low. I got an intermittment high pitched whine between 1000-2000 rpm. With the full reservoir, the noise has gone away (so far). I also have a drip from my reservoir supply pump pipe which needs fixing too!
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