Whirring noise coming from my engine bay - Audi S5 B9

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wutang200

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I have a whirring noise coming from the front of my engine bay. It happens when the engine is hot or cold and increases with revs. Any ideas what this could be?

I’ll take a short video of the issue and attach a link here. The car is on 85k miles.
 
I sprayed a little bit of WD40 on the front belts today and the sound instantly went away when I sprayed the bottom belt. Will get it diagnosed at my next service interval and see what Audi quote me.
 
Just to update this thread, the issue turned out to be a lot of play in the water pump rather than the belts. The whole job cost me £3.5k!

Next job is the PCV valve & breather pipe which is leaking oil out of the filler cap.
 
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