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