Engine Cooling System - Mechanism & Function (H6DO): General

The engine cooling system consists of a down-flow radiator featuring high heat-dissipation performance, an electric-motor-driven fan, a water pump, a thermostat, and an engine coolant temperature sensor.
The reservoir tank is designed to eliminate the need for replenishing coolant.
The ECM controls the operation of the radiator main fan and sub fan depending on the signals from the engine coolant temperature sensor, vehicle speed sensor, A/C switch and A/C mid pressure switch.