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One of the problems is that Classic Roadsters have a poor wiring harness with too small a gauge of wire. Check the voltage at your exiting fan. I bet you are only getting about 9 volts to it. Put in a fused relay directly off the battery, but switched by your current fan wires, and the fan will spin a lot faster, and there is a very good chance you will no longer have cooling problems.
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LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
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