The coolant circuit is controlled by a thermostat. When the engine is cold, the coolant circulates only in the cylinder head, cylinder block and heat exchanger. As the engine warms up, the thermostat opens the large circuit of the cooling system. The coolant is supplied by a constantly running pump through the radiator of the cooling system. The coolant passes through the radiator from top to bottom, being cooled by the air passing between the radiator fins.
When the coolant temperature is in the range of 92–97°C, the thermal switch turns on the radiator electric fan. The electric fan is driven by an electric motor and operates until the coolant temperature drops below 84–91°C.
Warning! Be careful - the radiator electric fan may turn on even when the ignition is off. Due to the heat in the engine compartment, this may happen several times.
Due to the fact that the fan operates intermittently, the useful power of the engine increases and fuel consumption decreases.
Housingless thermostat of the cooling system – with a solid temperature-sensitive filler.
The cooling system radiator is tubular-plate, aluminum, with plastic tanks. The cooling liquid is poured into the system through the filler neck of the expansion tank, the plug of which is equipped with inlet and outlet valves.