Ok, let's try this- - - - -electric fans suck- - - -or blow- - - -depending on where they're mounted. Either way, nothing beats a good engine driven fan. As long as the coolant doesn't boil, temperatures below 250 degrees are pretty common on modern engines. That's why most temp gauges read Cold/Normal/Hot instead of showing actual temp in degrees to keep drivers from getting an attack of the vapors when the coolant approaches the "no pressure" boiling point. The heater core pressure tolerance is the limiting factor on a stovebolt with a modern pressurized radiator, along with the piston skirt clearance. A 15 pound radiator cap will raise the boiling point of the coolant to 247 degrees, 3 degrees per pound of pressure over the normal 212 at sea level. As long as the pistons don't expand enough to create too much drag for reliable hot starting, all the angst about coolant temp is just something for snowflakes with lace on their drawers to obsess about. The thermostat sets the MINIMUM coolant temperature- - - -the cooling capacity of the radiator and the volume of air the fan can move is the determining factor of how steady the temp stays once the thermostat opens.
Jerry
