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The BMW Range
3 Series
E46
Unstable Engine Power
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<blockquote data-quote="moots" data-source="post: 731203" data-attributes="member: 219"><p>bro...from your description....and from what I have read,the e46 m54 uses the mechanical viscous coupled fan and it looks like your fan clutch is clutching at the slightest of overtemp.The roaring sound is the sound of your fan.The underpower is due to the drag of the fan.When stopped at traffic,at increased temps,the clutch engages and when at cruise,when air cools the bi metallic strip on the fan clutch,it disengages,fan freewheels and power is restored.</p><p></p><p>You need a new fan clutch.</p><p></p><p>If you have an electric fan...then disregard what I have written.</p></blockquote><p></p>
[QUOTE="moots, post: 731203, member: 219"] bro...from your description....and from what I have read,the e46 m54 uses the mechanical viscous coupled fan and it looks like your fan clutch is clutching at the slightest of overtemp.The roaring sound is the sound of your fan.The underpower is due to the drag of the fan.When stopped at traffic,at increased temps,the clutch engages and when at cruise,when air cools the bi metallic strip on the fan clutch,it disengages,fan freewheels and power is restored. You need a new fan clutch. If you have an electric fan...then disregard what I have written. [/QUOTE]
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The BMW Range
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Unstable Engine Power
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