Fitment: 1992 Mercedes-Benz 400SE 1993 Mercedes-Benz 400SEL 1993 Mercedes-Benz 500SEC 1992-1993 Mercedes-Benz 500SEL 1990-1993 Mercedes-Benz 500SL 1998-1999 Mercedes-Benz CL500 1994-1999 Mercedes-Benz S420 1994-1999 Mercedes-Benz S500 1994-1998 Mercedes-Benz SL500 What is a Fan Clutch? A fan clutch is a thermostatic engine cooling fan that can freewheel at low temperatures when cooling is not needed, allowing the engine to warm up faster, relieving unnecessary load on the engine. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine. .
