A high load is when multiple high-power systems such as ignition, radiator fan, heater blowers, lights and entertainment system are running at the same time.
Other factors influence the temperature of the engine, including radiator size and the type of radiator fan.
To save room and weight a dynastarter was used, which doubled as the axle of the radiator fan.
Marine engines, as supplied, usually have no radiator fan, and often no alternator.
In such cases the quoted power rating does not allow for losses in the radiator fan and alternator.
An identification detail of the GP20 is the small radiator fan added ahead of the large aft fan.
There are three large radiator fans at the rear of the hood and a single fan in the middle for the dynamic brakes (if equipped).
Winterization included a winterization hatch over one of the radiator fans, to direct warm air back into the engine compartment.
One day, he said, he was taking apart automobile parts when he noticed the radiator fan and thought, "Maybe I could use this for something."
The radiator fans were recessed within the carbody, and arranged in two pairs, one near each end of the locomotive.