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Antifreeze in the cooling system

Antifreeze in the cooling system Heater hoses In the heater, hot coolant circulates through a matrix, heating the air which is blown into the car. Coolant circulates through passages in the engine block and cylinder head. Lower radiator hose Thermostat Upper radiator hose Radiator

The radiator contains piping through which the coolant circulates, losing heat. The thermostat is typically a spring-loaded valve that opens and closes according to the temperature of the coolant.