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you should have a viscous coupling which unloads the fan when no thermal load off the heat exchangers flows across the fins of the coupling's housing.In theory,the fan should be completely unloaded above 40-mph ( 63 km/h ).A fixed-drive fan as in the Crisis Fighter Pinto project would have absorbed a full mpg at 70 mph.Today's coupled fans should not have that kind of power loss.
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