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Fan clutch

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How do you tell if the fan clutch is failing on an E39 M5? Mine is seemingly on most of the time - I thought they were supposed to startup when the car is started and go off after two minutes? The part is circa £200 so keen not to throw money at it if it doesn't need doing.

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If there's little noticeable difference turning the fan by hand when engine is hot and cold it's usually done.

 

Depending where you are in Oxfordshire I have a know good one you're welcome to try.

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Ah ok. I'll try that test. No longer in Oxfordshire; now Wiltshire, thanks for the offer though.

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Classic way of diagnosing a problem from the M5 forum:

 

"You can use a rolled newspaper technique to see if the clutch is engaged. If the fan slows and stops with the rolled newspaper, the clutch is bad."

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It's a braver man than me who sticks something in to a moving fan!

 

Have you considered removing it altogether? I removed it on both my M5s, as long as your electric auxillary/pusher fan is good it doesn't have a problem staying cool in our climate (even in last years hot summer).

 

Cheers, Rob

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4 hours ago, ttrw2 said:

It's a braver man than me who sticks something in to a moving fan!

 

Have you considered removing it altogether? I removed it on both my M5s, as long as your electric auxillary/pusher fan is good it doesn't have a problem staying cool in our climate (even in last years hot summer).

 

Cheers, Rob

Thats interesting Rob, you mean just literally remove the fan and clutch assembly? Saves a lot of cash as the genuine ones are pricey and fans are known to explode and go through the bonnet!

 

Do we get an extra 50bhp too.... ;)

 

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