[SteveAus]

I had this AC noise problem last year in Nov/Dec and again in Jan.
It was most noticeable when you hit Max AC.

On both occasions I took the car to the dealer and leaves were removed from the fan. Having seen this thread, I asked about having netting retro-fitted to eliminate the problem, but the Service guys told me no such part was available.

Sadly, now waiting for the noise to return at this same time of year.

BTW, I park my car in a garage for most of the year because I work overseas, and when I do take it out I avoid parking under trees, but still the issue has occurred. There is an inherent design flaw in the intake for the fan. I have never had this issue with any other BMW I have owned.