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By fitting an electric fan (and getting rid of the old one) you save energy used by the engine and therefore it'll more efficient and economical. If you fit the right temperature switch to begin with then there's no need for an adjustable one. If your engine is running at the right temperature now then you don't need an auxiliary fan so do away with the mechanical one and go lekky. On tickover the mechanical fan is hardly doing any work and that is when you need the extra cooling, stuck in a traffic jam in the middle of summer (remember summer) that is when the electric version comes into it's own. There is enough forced draft air through the rad when you are on the move to keep things cool if everything is working OK. An electric one fitted behind the rad is more efficient but space is restricted (unless you move the rad forward) I know commerjules has installed one in front and it works a treat.
While your at it bung in a lekky water pump and save even more horses
It's the not knowing what the right temperature sensor is in the first place that worries me! Suppose it should be 88-90 degrees. Someone told me that electric fans aren't as powerful as an engine driven fan even at idle speed - any truth in this? Doesn't sound right to me.