The air conditioner fan replacement must be carried out in the following order. Remove the instrument panel trim and the heater, this will make it easier to remove the fan. Release the clamps (1, Fig. 17.53) and remove the cover (2).
Disconnect the SS (1, Fig. 17.54) and unscrew the screws (2). Unscrew the air conditioner unit fan (3) in the direction indicated by the arrow.
The fan installation should be carried out in reverse order.
(This publication was borrowed from an online resource «BMWman»)