Odd noise, what can it be?

[Dizz]

CLK320 2004 (94,000 miles)

Oil display shows correct level.

Service due in 3,000 miles.


Its not there on a cold start up but starts very soon after. Increasing with more revs and seems to be coming from top left of the engine.


Should I be worried and should I be driving it?

Thanks

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[stwat]

It sounds like a worn pulley bearing.

 

[Dizz]

Thanks
Anybody else think it’s a worn pulley bearing?


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[alecmascot]

Alternator pulley clutch....
Take the belt off and run the engine for a little while and see if the noise goes away.

 

[Dizz]

UPDATE....
Well the answer was actually that it needed a new water pump.
All fixed today by the great team at ‘PCS’


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