Cooling System: Description and Operation

Cooling system







The liquid-cooled engine is equipped with a closed cooling system.

The system consists of an inner and an outer circuit, the latter including the radiator and expansion tank. Other parts of the system and of the car heating system are considered part of the inner circuit.

The outer circuit is isolated when the engine temperature is below the thermostat opening temperature. Under these conditions, coolant is returned to the pump inlet through a by-pass in the cylinder head.

The system is filled (either when empty or when topping up) through the expansion tank.

Genuine Volvo coolant diluted with clean water in proportions of 50/50 is the only coolant guaranteed by Volvo to prevent corrosion and freezing damage.

Type C (blue-green) coolant may not be mixed with any other type.

The coolant must be replaced every second year to ensure protection against corrosion.