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Then the buzzing noise is coming from a small fan that is behind the grille you see,it's there for the interior temperature sensor for the climate control.
There is a thread on here about lubricating the fan to reduce the noise on a Laguna 2.The fan in those is mounted into the rear view mirror but the principal behind it is the same.I'll find it and leave a link for you,back in a mo.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo