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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > N55 humming noise



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      02-19-2014, 02:52 PM   #1
Amini77
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2006 330XI  [3.75]
N55 humming noise

What's this humming noise coming from my N55 535i?

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      02-19-2014, 03:28 PM   #2
DesertBMW
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water pump running full blast.
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      02-24-2014, 12:53 PM   #3
Andrewe92
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yikes
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      02-24-2014, 03:30 PM   #4
Amini77
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water pump running full blast.
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yikes
I was researching a lot of people say its the ECU fan?
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