Fitment: RAM 2500 2013-2018 RAM 3500 2013-2018 RAM 4000 2013 RAM 4500 2013-2018 RAM 5500 2013-2018 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. .
