Generator Fan Blower

[johnklopp]

Most liquid heat exchangers are designed for a 10 F degree drop at full load. The temperature drop will increase at light load due to the reduced flow caused by the modulating thermostat. The design point of all heat exchangers is the approach temperature which is a measurement of the difference between the outlet water temperature and the inlet air temperature acros the heat exchanger. Typical design conditions represent an approach temperature of 40 degrees F.

An impeller that has lost its vanes is rather unlikely. The most probable problem in my opinion was pointed out by Jon as a collapsed hose on the suction side of the pump. The suction hoses typically have a spring on the inside of the hose to prevent collapse when the engine cools and the water volume is reduced.

You should be able to determine if you have circulation and heat transfer by using your infrared thermometer If you don’t have one, you should, how else can you check your tires on those short rest stops?