64 12 577 Replacing changeover valve for independent/auxiliary heating

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WARNING: Risk of scalding!
Only perform the following repair work on an engine that has cooled down.
Follow notes for repair work on cooling system . See 17 00 039 VENTING AND FILLING COOLING SYSTEM WITH VACUUM FILLING UNIT , 17 00 039 BLEED COOLING SYSTEM AND CHECK FOR WATERTIGHTNESS (N52T, N53, N55) or 17 00 039 BLEEDING COOLING SYSTEM AND CHECKING FOR WATERTIGHTNESS (N63 B44 O 0) .

Necessary preliminary work:

COMPLETELY REMOVE THE INDEPENDENT HEATER .

IMPORTANT: Risk of damage!
Observe marked coolant flow direction.

NOTE: Mark position of coolant hoses prior to dismantling.

Release spring clamps (1) and detach coolant hoses.

Fig 1: Identifying Spring Clamps

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (1) and disconnect.

Unfasten screws (2).

Remove changeover valve for independent/auxiliary heating (3).

Fig 2: Identifying Independent/Auxiliary Heating Changeover Valve, Plug Connection And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

After installation:

Top up coolant and vent cooling system . See 17 00 039 VENTING AND FILLING COOLING SYSTEM WITH VACUUM FILLING UNIT , 17 00 039 BLEED COOLING SYSTEM AND CHECK FOR WATERTIGHTNESS (N52T, N53, N55) or 17 00 039 BLEEDING COOLING SYSTEM AND CHECKING FOR WATERTIGHTNESS (N63 B44 O 0) .