Cooling Fans

The cooling fans are variable speed electric fans installed in a housing attached to the rear of the radiator. The motor of each cooling fan is connected to a cooling fan ECU, located on the rear of the cooling fan housing. The cooling fan ECU is controlled by the Engine Control Module (ECM). The ECM controls the operation of cooling fans via a Pulse Width Modulated (PWM) signal to the cooling fan ECU. The cooling fan ECU regulates the voltage of a common power feed to the 2 fans, and relates the voltage to the duty cycle of the PWM signal.