64 12... Bleeding independent heating (Thermo Top S)

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Special tools required:

170 002
170 005

Top up coolant. See 17 00 005 DRAINING AND TOPPING UP COOLANT .

Fit special tool 17 0 002/17 0 005 to expansion tank and develop a pressure of approx. 1.5 bar. Check cooling system for water leaks when doing so.

Fig 1: Installing Special Tool To Expansion Tank (Thermo Top S)

Courtesy of BMW OF NORTH AMERICA, INC.

Remove microfilter on left. See Microfilter .

Open bleeder screw until bubble-free coolant emerges. Close bleeder screw, undo hose clip.

Start independent parking heater and wait for combustion. Start engine and run at 4000 RPM. The independent heating system assumes after-running mode. The circulation pump continues to operate. Within 2 minutes of starting engine, open and close bleeder screw on independent heating unit several times. Allow engine to warm up until thermostat valve opens. This completes the venting process. Turn off engine, allow to cool down and check coolant level; if necessary, draw off or top up. See 17 00 005 DRAINING AND TOPPING UP COOLANT .

Fig 2: Locating Vent Plug

Courtesy of BMW OF NORTH AMERICA, INC.