AC/ Heater blower fan in my 300SE with psg airbag is starting to make funny noises, mostly in high speed and when I turn a corner.

How hard of a job is this with a psg side airbag in the way?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).