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Bob,
A good viscous fan clutch always has some drag on the engine, even when cold. The electric fan only comes on when it's needed, also the battery acts as a buffer so the demands on the alternator all at once is not as bad as you might think.
I've got a 940 fan and I'm in the middle of changing over, hope to fit and wire it this weekend. If nothing else it makes for super easy belt changes.
I'm wiring up a tattletale light to see just when the fan is working, from what I've heard it's only when standing still but it will be nice to know for sure. Plue if no benefit is found it's easy to switch back.
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Dave Shannon Spring Valley, California '67 1800s '73 1800ES '88-240 my pages
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