Cooling Fan Control

Cooling Fan Control Outline
In order to maximize cooling efficiency and minimize cooling fan motor drive current, radiator fan and condenser fan speeds are controlled using three speed modes such as low, medium, and high speed, on the basis of coolant temperature, car speed, air conditioning switch signal, and conditioning compressor operation signal.
Cooling fan speed is controlled using three speeds as low, medium, and high speed by ECU that grounds LO terminal, HI terminal or both terminals to control the speed.The relays are controlled depending on engine logic table using coolant temperature and car speed as important variables. Conventional cooling fan control relies on coolant temperature. On the contrary car speed is also used for this type of advanced control.
You can check the actuator actual value and status and activate it when it is possible by AutoHex Diagnostic Scanner under the supported car brand and according to engine type.