The nine-blade fan is mounted on the coolant pump shaft and is designed to create an air flow through the radiator. The fan impeller has a diameter of 420 mm and is connected to the coolant pump drive through a viscous coupling.
The viscous coupling is manufactured by «Holset» or «Fichtel und Sachs». The activation and deactivation of the viscous fan clutch depends on the temperature of the engine and on the speed of its crankshaft.
The fan switch-on temperature is 88–92°С, and the fan switch-off temperature is 60–65°С.
Axial clearance of the viscous coupling rotor, no more than 0.4 mm.
Radial clearance of the viscous coupling rotor, no more than 0.65 mm.