Digital Variable Speed Fan Controller ProformMaintaining a consistent engine temperature is a more efficient way to keep your engine cool. Many other fan controllers turn the fan on when the engine is getting too hot, and turn it off after expending a lot of energy cooling it. The hard turn on leads to amperage spikes, and the max speed usage can be noisy. These problems will be reduced substantially with Proform's new variable speed controller. This variable speed fan controller makes the fan