64 11 225 Replacing controller for heating and A/C system blower

Release screws (1) and feed out cover (2) towards bottom.

Fig 1: Releasing Screws (1) And Feeding Out Cover (2) Toward Bottom

Courtesy of BMW OF NORTH AMERICA, INC.

There are two controller versions for the heating and air conditioning system.

Version A: 

Disconnect plug connection (1).

Turn controller (2) to left slightly and remove.

Fig 2: Removing Controller

Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Mark (1) on controller must line up with mark (2) on heating and air-conditioning unit.

Fig 3: Identifying Marking On Controller And Heater

Courtesy of BMW OF NORTH AMERICA, INC.

Version B: 

Unfasten plug connection (1) and disconnect.

Fig 4: Identifying Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Release lock (1). Slide controller (2) upwards slightly and pull out of heating and air-conditioning unit (3).

Fig 5: Removing Heating And Air Conditioning Unit

Courtesy of BMW OF NORTH AMERICA, INC.