Fitment: 1990-1991 Dodge Dakota 1994-1996 Ford Bronco 1990-1996 Ford E-150 Econoline 1990-1996 Ford E-150 Econoline Club Wagon 1990-1991 Ford E-250 Econoline 1994-1996 Ford F-150 1994-1996 Ford F-250 1984-1986 Ford LTD 1984-1986 Mercury Grand Marquis 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. .