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If the fan is spinning at the same speed as the air rushing through the engine bay, it's not costing you anything.
Remember that a mechanical belt pulley system is a fairly efficient way to transfer power, compared to alternator>battery>fan.
If the fan is on a separate belt and you can delete it all together, you might see gains, if the fan pulley is on a serpentine belt, gains are less likely.
The results from mechanical to electric fan swaps have been mixed.
Last edited by oldtamiyaphile; 01-06-2016 at 09:28 AM..
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