Below is video tutorial about electric cooling fan circuit. This circuit is consist of a fan motor, engine control module, ECT sensor, and an A/C fan control module. ECT sensor is used to sense the condition of the engine. If the engine getting hot, ECT sensor will give a signal to the engine control module to turn on the fan motor.
When the temperature getting normal, the fan motor will be switched off. To control the speed of the fan motor, we can use the A/C fan control module. We can switch the speed in low or high using this module.