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is it worth replacing the pully-powered fan (Disco 1) with an electric unit? i thought the removal of the drag may increase usable power/improve efficiency.
There is no electric switch on a viscous fan clutch, it is controlled by a bi-metalic spring. When it gets hot it locks the clutch. The clutch is filled with liquid.
no sorry what i ment is that i was thinking of switching to a electric fan but didn't know if i wanted to and then i wanted to replace the stock fan but didn't know if it would be any better.