13667044

Troubleshooting

Symptoms		Possible Causes		Remedy
Coolant leakage	● From the thermostat gasket	Check the mounting bolts	● Check the torque of the mounting bolts	● Retighten the bolts and check for leakage again.
Coolant leakage	● From the thermostat gasket	Check the gasket for damage	● Check gasket or seal for damage	● Replace gaskets and reuse the thermostat.
Cooled excessively	● Low heater performance (cool air blows out) ● Thermogauge indicates 'LOW'	Visually check after removing the radiator cap.	● Insufficient coolant or leakage.	● After refilling coolant, recheck.
		Check GDS & start engine	● Check DTCs ● Check the fan motor performance as temperature varies. ● Check connection of the fan clutch or the fan motor. ※ If the fan clutch is always connected, there will be a noise at idle.	● Check the engine coolant sensor, wiring and connectors. ● Check the fan motor, the relay and the connector. ● Replace the components.
		Remove the thermostat and inspect	● Check for dust or chips in the thermostat valve. ● Check for sticky thermostat valve.	● Clean the thermostat valve and reuse the thermostat. ● Replace the thermostat, if it doesn't work properly.
Heated excessively	● Engine overheated ● Thermogauge indicates 'HI'	Visually check after removing the radiator cap.	● Insufficient coolant or leakage. ※ Be careful when removing the radiator cap from an overheated vehicle. ● Check air in cooling system.	● After refilling coolant, recheck. ● Check the cylinder head gaskets for damage and the tightening torque of the mounting bolts.
		Check GDS & start engine	● Check DTCs ● Check the fan motor performance as temperature varies. ● Check if the fan clutch slips. ● Check for sticky water pump or damaged impeller.	● Check the engine coolant sensor, wiring and connectors. ● Check the fan motor, the relay and the connector. ● Replace the fan clutch, if it doesn't work properly. ● Replace the water pump, if it doesn't work properly.
		Immerse the thermostat in boiling water and inspect.	● After removing the thermostat, check that it works properly. ※Check that the thermostat opens at the valve opening temperature.	● Replace the thermostat, if it doesn't work properly.