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Unless the present system has capacity problems maintaining the correct temp, an aluminum radiator will not make a difference. If the system has a 190º stat and the current radiator just cannot keep up on a very hot day, and there are no internal problems such as clogged passages, nasty high viscosity coolant, etc, then an aluminum radiator of comparable size will have more capacity to cool. I have never understood some people on some sites posting the have a 180º stat, and the vehicle will not cool on a mildly warm day below 210º, so they buy a new high capacity aluminum radiator and now it runs 160º all day no matter how hot. No radiator, regardless how big it is will cause a vehicle to run cooler than the thermostat temp that is installed unless it has some magical power to override a mechanical thermostat. So I don't understand some ads I have seen in the past stating something like this radiator wiill lower your operating temps by 40º.