Bleeding the cooling system


The electric coolant pump is responsible for cooling the engine. During workshop operations, the pump must be checked to ensure it has not dried out, as this may damage the pump. If the pump is removed or a new pump fitted it must be filled with coolant before being fitted. Otherwise the bearing races inside the pump may be damaged. After the pump has been fitted and filled with coolant, the "Bleeding, cooling system" function must be run.

Test conditions:

Procedure:

  1. Start the function.

  2. Set the temperature control to the maximum setting.

  3. Press the air conditioning system Auto button (not applicable to E90).

  4. Set the blower speed (passenger compartment blower) to the minimum setting but do not switch it off completely.

  5. Fully depress the accelerator for 10 seconds.

  6. Press "OK" to start the pump procedure.

  7. The procedure takes approximately 12 minutes to complete. The procedure can be aborted at any time by pressing "OK". The current pump speed is shown as a percentage.

  8. Once the procedure is complete, the electric coolant pump should be shut off by switching off the ignition.