64 12 520 Removing and installing / replacing control unit with heat exchanger (Thermo Top S): Installation:

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 BMW 540i, 2002 BMW 540i, 2001 BMW 540i, 2000 BMW 540i, and 1999 BMW 540i. However, it is still accessible from the selected car via links, so may be relevant.

Observe tightening torque 64 12 8AZ in HEATING AND AIR CONDITIONING - TIGHTENING TORQUE .

Fig 1: Removing Combustion Air Blower Unit

Courtesy of BMW OF NORTH AMERICA, INC.

Replace sealing rings and ensure they are correctly seated.

Fig 2: Identifying Sealing Rings Proper Seatings

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws and remove control unit with heat exchanger.

Observe tightening torque. See
64 12 10AZ in HEATING AND AIR CONDITIONING - TIGHTENING TORQUE .

Fig 3: Removing Control Unit With Heat Exchanger

Courtesy of BMW OF NORTH AMERICA, INC.

Replace sealing rings and ensure they are correctly seated.

Fig 4: Identifying Sealing Rings Proper Seatings

Courtesy of BMW OF NORTH AMERICA, INC.