There is also the Electric fan option, Good ones can move a lot of air, don't rob anything from the engine and can be had in push or pull versions. My old Motorhome has several electric fans for the various coolers. 33 feet, 454 chev, Turbo 400, Gear vendor overdirve and never had a cooling issue in more than 15 years.
Not true. You can't get away from robbing some power to cool the engine. Either mechanical fan(s), mechanical water pump = HP from pulleys.
Or, electical fan(s), electric water pump = HP from alternator drag.
Or, any combo of both.
My OEM theory is, a pickup, motorhome, what have you, doesn't overheat when it's new. Uphill, loaded, A/C, whatever. Right?
Well, if it starts to overheat under any of those conditions, something is going out. If we add electric fans, we are now adding more HP draw to keep it cool. Therefore, if you keep the radiator cleaned out (internally and externally) and stay with the stock HD fan and clutch....there should be no problem.
Not true. You can't get away from robbing some power to cool the engine.
Or, electical fan(s), electric water pump = HP from alternator drag.
Certainly true. Perhaps what I should have said is that an electric fan does not rob anymore HP than you are already losing. The alternator does not vary it's load on the engine. When it is energized it has a set load, and adding additional electrical devices does not increase the load on the engine. IE, the alternator does not work harder. A clutch fan is the opposit, the more you need it the less the clutch slips and the more the engine has to work to turn it. On a motorhome with all the electric this thats and whatever's you have a load from the alternator nearly all the time. adding an electric fan in place of a clutch fan will free up some horsepower by reducing the overall load on the engine. May not be enough to make a difference though.
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