BMW 3 Owners & Service Manuals

BMW 3: Antifreeze and corrosion inhibitor

The cooling system of the G20 PHEV is filled with the new antifreeze and corrosion inhibitor Frostox HT-12. The new antifreeze and corrosion inhibitor increases the long-term stability and corrosion protection of the components. It replaces the well-known antifreeze and corrosion inhibitor Glysantin G48.

Like the G48, the HT-12 contains silicate and forms a silicate passivation layer on metallic component surfaces to prevent corrosion.

Antifreeze and corrosion inhibitors cannot be mixed with each other in any manner. If they are mixed, it may cause the antifreeze and corrosion inhibitor to gel, thus causing damage. The selection of the correct antifreeze and corrosion inhibitor is only possible via the workshop information system using the part number.

Automated coolant bleeding routine

When components have been replaced on the low-temperature coolant circuit or the cooling system has been filled, an automated coolant bleeding routine must be carried out. Otherwise, there is a risk of damage to the components to be cooled.

The actuators in the cooling system are activated during the automated coolant bleeding routine.

The automated coolant bleeding routine is completed after around 10 minutes.

The following prerequisites must be satisfied to be able to carry out an automated coolant bleeding routine on the low-temperature coolant circuit:

  • Charging cable not connected at the high-voltage connection
  • Open hood
  • Check and if necessary correct coolant level in the expansion tank
  • Connect 12 V battery charger to the jump start terminal point and switch on
  • Activate PAD mode
  • Set temperature of the integrated automatic heating/air conditioning system to the highest temperature
  • Select the lowest blower speed.

Proceed as follows to start the automated coolant bleeding routine:

  • Press the accelerator pedal as far as the limit position for at least 10 seconds (do not press the brake pedal while doing so)
  • Release accelerator pedal.

The starting and ending of the automated coolant bleeding routine is displayed in the instrument cluster.

After completing the service function, check and if necessary correct the coolant level in the expansion tank and switch off and disconnect the 12 V battery charger.

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