How does a clutch fan operate?

I had to reread this thread, I thought I was on the weather channel. Orangeswinger you can go with a flex fan an aftermarket fan blades that flex under high engine rpm. The fan flex blades are made to have full blade pitch when in the idle mode thus having full air flow, when driving the blades of the fan flatten out (high engine rpm) you don't need the fan working if you are going 60 down the road. If you go this route you may have to buy spacers and use longer bolts to go between the pump shaft and fan blade. You have to keep the blade inside the fan housing to have proper cooling. They sell the flex blade and spacers on the net.