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Message: <blockquote data-quote="t2ribena" data-source="post: 601611" data-attributes="member: 3847">to reduce the parasitic drag thus allowing the engine to churns out more power and increase the engine efficiency...now with the efficient dynamics thingy...they even 'cut-off' the alternator charging circuit to the battery when you put your foot on the accelerator pedal and activates this charging circuit only when you off pedal or brake...that's the brake energy regeneration in the current ED cars... the 'mechanical' fan can also fail as there is a fluid coupling clutch like astroboy says...its part of wear and tear...i think its more towards your psychology confidence on how this should work and not...but the truth is otherwise...i have seen failing clutches as many as electrical fan failure...</blockquote>