64 12 520 Removing and installing / replacing control unit with heat exchanger (Thermo Top S): Notes
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.
Remove combustion air blower unit
Remove complete heater. See 64 12 500 Removing and installing / replacing complete heater (Thermo Top S) .
Remove burner insert. See 64 12 535 Removing and installing / replacing burner insert (Thermo Top S) .
Release screws and remove combustion air blower unit.