Cooling System: Description and Operation

Fan Operating Mode:

- The engine control module controls the power transistors (high speed and low speed) in the module to provide radiator fan motor and condenser fan motor rotation controls in accordance with the engine coolant temperature and vehicle speed.
- When the engine control module turns on the power transistor in the module, the current flows to the engine control module through the fan motor relay coil. If the current flows to the fan motor relay coil, the switch of the relay turns on to supply the motor driving power. This will cause the current to flow from the battery to the radiator fan motor and the condenser fan motor through the respective relay switches.
- When both air conditioning switch and refrigerant medium pressure switch are ON, the radiator fan motor and the condenser fan motor rotate at high speeds regardless of the vehicle speed and the engine coolant temperature.