Food for thought. If you replace the viscous fan with an electric fan, you won't gain HP or MPG. If the fan is off, there is little load on the engine. If the electric fan is on, the alternator has to supply the power to run it. Believe me, for the same air flow and cooling the viscous fan puts less load on the engine than the electric fan. If the electric fan used less power for the same output then you are getting something for nothing. Ain't going to happen.

Paul

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84 500 SEL (307,xxx miles)