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Message: <blockquote data-quote="astroboy" data-source="post: 601648" data-attributes="member: 4527">Don't forget with electric fan, it can be selectively cut off, hence zero load to dynamo, maximum engine output channeled to the wheels and improve fuel efficiency. This happens during the engine warm up time, or when vehicle are traveling high speed, or when engine temperature cooled down after running the electric fan. With the modern engine, during pickup, the fan will cut too, until accelerator pedal is eased. [subject to safety limit of engine temperature not breached]With clutch fan, little can be done and still, an electric fan is needed for aircond. Where as with electric radiator fan, it has different stages and also served as aircond fan. So it's one for all. Effective use of engine space and one less component for maintenance.When it comes to cooling efficiency, clutch fan is always limited to the rpm of the car, imagine stuck in stand still traffic with idling engine speed, even with 1:1 spinning ratio, the clutch fan is only spinning at 800rpm compare to electric fan of over 10k rpm.And yes.. battery powers the electric fan, and only will be charged [load to dynamo] when it fell below certain voltage, otherwise, no load to dynamo despite electric fan spinning.</blockquote>