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Electric Cooling Fans
I've read a lot of claims by members on explorerforum.com who say they've gained 2-3 mpg by removing the stock belt driven fan and replacing it with an electric one. The gain is made even more when they installed a thermostat which slowly ramps up the speed of the fan. When the engine is slightly hot it will run the fan at maybe 10% speed. Then as the engine gets a few degrees hotter the fan will increase to maybe 20% speed etc. Also, the power sent to the fan is controlled by PWM instead of heat sinks. As most of you know, PWM controls speed by pulsing the power rather than wasting it by converting it to heat.
Basically when your on the highway you don't really need a fan, and the electric one shuts off, but the belt driven one is always on even though the clutch is helping. I'm planning this mod to my explorer in the near future. Just thought I'd share the info/pass it along.
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Threaded Mode
