Cooling System: Description and Operation

The cooling system consists of:
^ Radiator
^ Engine cooling fan motor
^ Water pump
^ Water thermostat
^ Radiator coolant recovery reservoir
^ Engine Coolant Temperature Sensor (ECT sensor)
^ Water temperature indicator sender unit
^ Low Fan Control (FC) relay
^ High Fan Control (FC) relay
^ A/C pressure cut-off switch

The radiator is a crossflow type that uses a vacuum-brazed, flat aluminum core with two molded plastic end tanks.

The two-speed engine cooling fan motor is mounted within the fan shroud behind the radiator.

The impeller-type water pump is mounted directly on the front of the cylinder block and is driven by the water pump pulley and drive belt.

The water thermostat is a bottom-bypass type used for improved cooling efficiency. It is located inside of the water hose connection.
Electrical System

The engine coolant temperature sensor (ECT sensor) measures coolant temperature at the water outlet connection and supplies this information to the powertrain control module (PCM).








Power to the engine cooling fan motor is controlled by the PCM based on the sensor unit. The PCM activates either the low fan control (FC) relay or the high FC relay. Refer to the chart.