Technical Clip for Mark Vlll Electric Fan

Good stuff!

Technically you shouldn't need the fan while you're moving at speed. That depends on aerodynamics and the grill size opening.

A good test is to run the engine up to temperature, let it get about 10 above the thermostat set temp and then turn on the fan. You Should be able to watch the The guage drop back down.

 

Sounds like if it went up on the road that it needs more radiator.