SACHS FAN CLUTCH
Manufacturing part number 2100 019 031

A fan coupling clutch is an important mechanical device that is installed between the engine and the fan in a vehicle's cooling system. The purpose of this device is to control the movement of the fan based on the temperature of the coolant in the engine. When the engine is running hot, the clutch engages and allows the fan to turn at full speed, which helps to increase the flow of air through the radiator and cools the engine down. Conversely, when the engine is running cool, the clutch disengages and the fan turns at a slower speed, which reduces the amount of air flow through the radiator and allows the engine to warm up more quickly.

The fan coupling clutch works by using a fluid-filled viscous coupling mechanism that is located between the fan and the engine. The fluid inside the coupling is designed to thicken or thin out depending on the temperature of the engine. When the engine is hot, the fluid thickens and causes the fan to turn at a higher speed. When the engine is cool, the fluid thins out and allows the fan to turn at a slower speed. This mechanism allows the fan to operate at the optimal speed for the current engine temperature, which helps to maintain the engine at a consistent temperature and prevent it from overheating or running too cool. Overall, the fan coupling clutch is an essential component of a vehicle's cooling system, ensuring that the engine remains at a safe and optimal temperature for optimal performance and longevity.