Side or rear radiator diesel pusher

The electric fan clutch shuts the fan OFF when it is not needed saving fuel and horsepower on rear radiator coaches. It does not power the fans to run faster when sitting in traffic. Big trucks have this same feature but the clutch is air operated. Same thing though, even though the clutch locks up when the temp switch says it needs more cooling the fan can only run as fast as the engine is turning. Hydraulic fans can as fast or slow as is needed by the temp switch regardless of engine or coach speed.