turbine like whirring on acceleration - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 05-20-2013, 12:23 PM
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turbine like whirring on acceleration

1998 323ic. Replaced Radiator, water pump, thermostat, belts, hoses, idler and tensioner pulley, fan and fan clutch. Everything seems to work fine with no temperature issues, but now I have this turbine like whirring rushing sound for the first few minutes on the road. Don't hear it at idle but as soon as I take off. It will go away after a few minutes not to be heard again till cold start.
Wonder if it could be a stiff fan clutch that stops once it warms a little. Any ideas out there? Thanks.
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#2 (permalink) Old 06-13-2013, 11:23 PM
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My clutch fan makes noise under 3k rpms .. Mechanical fans..
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#3 (permalink) Old 06-14-2013, 10:19 AM
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The clutch fan is designed to be engaged for up to three minutes when starting the engine. This is most likely the noise. The fan clutch engages and disengages as required to pull air in based on the engine temp.


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