Could be any of the following:
Air con belt tensioner
Alternator bearings
Water pump
timing belt idlers or tensioner

Spray some Wd-40 on to the air con belt tensioner first to eliminate that and see how you go.

I have a spare air con one if you need it.

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[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]