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      07-21-2012, 12:48 PM   #2
AlanAZ
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Drives: E90 325i sport manual
Join Date: Aug 2009
Location: Scottsdale, AZ

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The pump usually causes overheating - the thermostat fails to a full open position, to not cause an overheating condition. I won't say typical, but 90K mls is not unusual for the pump to fail.

Check this and the N52 engine sub-forums, there are a number of well-documented threads. And the DIY forum for changing the pump.