An air conditioning system is basically just a heat exchanger. It absorbs heat and humidity from inside the car (via the evaporator unit) and dissipates it back into the atmosphere through the condenser. Installing one puts extra strain on your car's existing cooling system. Our current radiator and mechanical fan was able to cool the 408 stroker, but it was working near its limit. To remedy this, we upgraded to a Flex-A-Lite radiator. The larger radiator will dissipate more heat, and the dual fans will suck a ton of air. If your current cooling system is in good shape, you shouldn't need to upgrade in order to run A/C.