Function: These fans are driven by an electric motor and are activated when the engine temperature reaches a certain threshold. They pull air through the radiator and help cool the engine coolant.
Common in: Modern Mercedes-Benz vehicles, especially those with smaller engines or turbocharged models.
Advantages: Quieter, more efficient, and can be controlled more precisely by the engine control unit (ECU).
Viscous (Mechanical) Cooling Fans:
Function: These fans are driven by the engine via a belt and pulley system. They use a viscous clutch that engages or disengages the fan's operation based on engine temperature.
Common in: Older Mercedes models or vehicles with larger engines (V8, V12, etc.).
Advantages: Simpler, no need for electric wiring or sensors.
