Cooling system parts for Volkswagen

The engine cooling system is designed to cool the vehicle's power unit. In most cases, antifreeze is used as a coolant. The circulation of antifreeze in the power unit is ensured by a pump, which is driven by the engine shafts. Sometimes, electrically driven auxiliary pumps are used along with the main pump. Typically, the cooling system has two circulation circuits: large and small. The large circuit includes a cooling radiator, which is blown by oncoming incoming air. In addition, the radiator is blown by a special fan. Depending on the temperature of the coolant, the thermostat opens or closes circulation in a large circuit of the system. Also, depending on the coolant temperature, the ECU turns the radiator cooling fan on and off. In the cold season and while the engine is cold, antifreeze circulates in a small circle without entering the cooling radiator. In the warm season and when the engine has warmed up, antifreeze circulates throughout a large circle of the system, passing through the radiator. The ECU receives information about the antifreeze temperature using temperature sensors. This maintains a constant engine operating temperature. In addition to the above elements, the cooling system has an expansion tank with a valve cap, rubber pipes with clamps, and a car interior heater radiator. More