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The electric fan is for the A/C. It only comes on when the coolant temp gets above ~195F AND when the A/C or defrost is on.
I removed this fan entirely from my car ('90 745T) 18 months ago, with no problems whatsoever. This is in the deep south, USA.
I also removed the crank powered fan and replaced it with a thermostatically controlled electric puller fan (PermaCool HiPo 16"-man, it moves a lot of air!). Much more efficient, and it gets that kludge electric pusher fan out of the way of the intercooler.
Ed O'Briant
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