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Message: <blockquote data-quote="ALBundy" data-source="post: 601645" data-attributes="member: 15">Ecco, the point is simple. The electric fan is decoupled from the crank shaft and hence no parasitic losses. Whatever drag that is on the electric fan will not impede engine performance, for instance under acceleration, as the energy is supplied by the battery and charged by the alternator when it is low. On the E92 M3, even the AC compressor automatically decouples itself under acceleration!On the mechanical fan clutch, the energy to drive the fan is derived directly from the engine via the crank shaft that drives the crank pulley which in return drives the water pump, air cond compressor, power steering pump and alternator, which are all termed as parasitic losses. That's why in the latest cars, we have electric powered steering and electric water pump. In essence you get higher nett power transferred to the rear wheels <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>