Usually fan problems are in the Final Stage Resistor (Hedgehog) buried in behind the center consul. (Try a search. Should be a how to in Articles or on YT.)
However a few have had to replace the blower fan and that is a real pain as the whole dash has to come out by all accounts.
Finally some have had problems with the head unit and had to repair or replace it.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i