I installed two spal 2200 cfm fans to the outside of the unit and had it run on a dyno twice. once with the fans running and once with the fans off. With the fans running, we got 6 mins or 6 miles up the hill before reaching high temp alarm. I removed the fans after having the new pump and fan motor up grade, but the issue still exist and I'm thinking about reinstalling them. The electrical fans uses a thermostat sending unit which is plugged into the engine water jacket that operated independent of the factory system.