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The radiator will always cool the same amount based on the temperature differential between the fins and air, as well as the velocity of the air moving past it. If you are pumping coolant through it at a faster rate, the heat transfer rate between the coolant and radiator will be much greater. Think convection ovens, the same principle applies w/ any fluid, not just air. Now, at some point there may be a reasonable trade off between power draw of the pump motor and the flow rate. Also, the higher the flow rate, the higher the friction, which means the current draw of the motor will increase tremendously, and friction of the fluid against the walls might start generating a little heat (though I doubt it will be much at all, we're not talking mach speeds here).
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