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

WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

Remove combustion air blower unit

Remove complete heater.

Remove burner insert.

Release screws and remove combustion air blower unit.

Installation:

Observe tightening torque, 64 12 8AZ.

Fig 1: Removing Combustion Air Blower Unit

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Installation:

Replace sealing rings and ensure they are correctly seated.

Fig 2: Replacing Sealing Rings

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Release screws and remove control unit with heat exchanger.

Installation:

Observe tightening torque,

64 12 10AZ.

Fig 3: Removing Control Unit With Heat Exchanger

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Replace sealing rings and ensure they are correctly seated.

Fig 4: Replacing Sealing Rings

Courtesy of BMW OF NORTH AMERICA, INC.