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I put a 4.0l radiator and a good electric fan on the 2.9l and the fan almost never kicks on. Even in the current 90 degree heat. I don't know that it would work in the hotter southern climates but it sure works up here. Just adding a real-world example to what MAKG was saying.Almost to an item, vehicles designed for electric fans come with larger radiators with respect to their displacements
X2there is a special tool for holding the pulley still while you crank on the fan clutch....
Yes, mechanical fan is alot more dependable. My hardcore wheeler has one for this very reason! And because it uses the factory fan clutch, deep water crossings are never a problem....I prefer a clutch over an electric. clutches do go bad with age but, they are more dependable than the electric ones. A properly functioning clutch does not use a considerable amount of torque or h.p.