The circulation of liquid in the engine is provided by a centrifugal pump mounted in the front part of the cylinder block. The heated liquid warms the valve body and the suction manifold. On cars with an automatic transmission, a transmission fluid cooler is mounted in the lower part of the radiator. On cars with air conditioning, a condenser is installed in front of the radiator. The impeller of the cooling fan is driven by a hydraulic clutch. On some cars, a thermostat is built into the clutch, i.e. the fan turns on after the engine warms up, when the impeller is engaged with the shaft by means of a thermo-bimetallic spiral spring. The clutch is non-separable and does not require maintenance.
1.2 Cooling system of 4-cylinder engines
1. Thermostat; 2. From the heater; 3. To the heater; 4. Damper body; 5. Thermostat valve
Antifreeze
A mixture of antifreeze and water in a ratio of 50/50 to 70/30 is poured into the cooling system.
Material borrowed from the website: nissanbook.ru