When we say cooling system, we don't mean just the radiator, there are other important parts that the cooling system cannot run without. One of them is the Honda fan clutch. This valve is responsible for controlling the flow of a viscous fluid between chambers in the clutch assembly, allowing the fan to function according to the engine's temperature. The clutch partially disengages the cooling fan when the engine is cold, making the fan turn at a low speed. Just like other components exposed to heat and pressure, the Honda fan clutch will eventually wear out, so you must take proper care of your fan clutch.