Put an evan on and it will go away lol. Mine did!
Actually, although the mechanical fan to electric fan is a popular mod, I dont really think it's all it's cut out to be...read this tid bit below;
"Some folks will preach that an electric fan is the ultimate swap, but I don't believe so in most older or "modified" cars. An electric fan simply cannot move anywhere near as much air as a good mechanical engine driven fan - and that's important to keep your hot rod cool. An electric fan is expensive and takes wiring, controls, and other such stuff to run. A mechanical thermostatic clutch fan bolts on and requires no maintenance, no wires, and costs about $70 to $100 for everything you need for the conversion. It will also likely last for 100,000 miles or more without problems. A mechanical fan takes less horsepower overall to turn. This may seem counter-intuitive, but an electric fan takes power from the electrical system which is in turn taking horsepower used to turn the alternator - and it can add up for high amperage things like a fan motor. You also "lose" energy in the conversion from mechanical power to electrical and from electrical power back to mechanical power again. Dyno tests from various magazines have confirmed that the lowest horsepower loss and the best cooling (basically the ideal combination) is using a clutch style fan. Who would have thought that something from the 1970's would be so perfect?
The only advantages an electric fan has are in mounting and in their "instant on/instant off" ability to regulate engine temperature more directly. For mounting, they can go in front of or behind the radiator and they can be mounted in some pretty tight places where a larger mechanical fan might not fit very well. The instant on/off control means they only spin when needed, and can be used to fine-tune the engine temp and allow for it to be much hotter and still not overheat, even to the point of running the fan after the engine shuts off to prevent the cooling system from boiling over. This ability to get hotter faster and run hotter is something newer cars use a lot for emissions purposes, but that's not a big concern for anything originally built with a carburetor and certainly not the primary consideration for a performance vehicle."
Source:
Thermostatic Clutch Fan