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Since I've totally removed the mechanical fan on my pickup and seen how little the fan is actually needed, I'd vote for a simple electric fan install just for the fact that- at least for my usage patterns- the fan is barely needed at all thus whatever inefficiency penalty there may be from the mech-elec-mech conversion losses is more than offset by the removal of all mechanical fan losses. Now, if there is a usage pattern that requires much more fan use- like on a tractor- I can see where the clutched mechanical fan would be the more efficient choice.
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