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