HELP. buzzing/wiering/humming noise on cold start up?

Bean5

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As above guys, been happebing for a couple of days, when I start my 2004 a4 1.8t
I get a strange buzzing/humming noise, sounds a bit like when the fan kicks in after/on a lobg journey,

had a look under the bonnet, and cant locate it to something specific, although it seems to be coming from the o/s

I have checked my power steering levels, water/coolant levels, all are ok.

So I went out this morning to film the noise on my phone and it didnt do it and It isnt particularly warm. Typical

Can anyone help me. If I can find out what it is and replace/fix it im happy, just dont want to make it worse.

Cheers