Kia Niro: Cooling System / Thermostat Troubleshooting

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 leakage again.

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 KDS/GDS and 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 adherence of the thermostat.

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 of the 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 KDS/GDS and start engine

Check DTCs

Check the fan motor performance as temperature varies.

Check if the fan clutch slips.

Check the water pump adherence or impeller damaged.

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 it works properly.

※ Check that the thermostat opens at the valve opening temperature.

Replace the thermostat, if it doesn't work properly.


Thermostat Repair procedures
Removal and Installation    Disassembly of the thermostat may have an adverse effect, causing deteriorated cooling e ...

Water Temperature Control Assembly Repair procedures
Removal and Installation Water Temperature Assembly    • Be sure to read and follow the “Gen ...

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