Attention: Since the radiators of the cooling system and heater are made of aluminum, antifreeze must be used (concentrate), certified by the manufacturer, and containing anti-corrosion additives.
Example
Measurement of coolant concentration gave a freezing point of -10°C. In this case, 3.0 liters of coolant must be drained from the cooling system and 3.0 liters of pure antifreeze should be poured into the system (concentrate). In this case, the freezing point of the coolant will drop to -35°.
Close the expansion tank cap and check the coolant concentration again after the test run.