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Swapping the engine fan for a Taurus fan is a popular mod.
But the engine driven fan is controlled by a clutch that has a temperature controlled "viscous coupling". At lower temperatures the clutch doesn't lock and not much energy is sapped from the engine. I don't know if it's worth swapping for an electric. The main reason people do it is so that offroad when the engine is spinning at low speeds, an electric fan can spin at whatever speed is necessary to move sufficient air through the radiator.
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