This isn't a fix for a cooling system that needs attention, but if once your system is in order and you still have too much heat an electric fan might help. They're automatic and run off a thermal switch. My electric fan sits outside the radiator (in front of it I mean) and the switch is located in the return pipe at the top of the radiator. Looks like a pretty simple installation, although mine could have been better. There used to be several radiator shops in South West Connecticut, all gone now unfortunately.