Cooling Circuits

Cooling Circuits




The cooling system operates in three different phases depending on the temperature of the engine coolant.
- 1st phase (thermostat closed)
When the engine coolant temperature is lower than the preset value, the thermostat remains closed. The coolant flows through the heater circuit. This permits the engine to warm up quickly.
- 2nd phase (thermostat open)
When the engine coolant temperature reaches the preset value, the thermostat opens. The coolant flows through the radiator where it is cooled.
- 3rd phase (thermostat open and radiator fan operating)
When the engine coolant temperature becomes higher than the preset value, the ECM receives a signal from the engine coolant temperature sensor and causes the radiator fan(s) to operate.