| Coolant leakage |
- From the thermostat gasket
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Check the mounting bolts |
- 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 |
- Low heater performance (cool air blowed-out)
- Temperature gauge indicates 'LOW'
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Visually check after removing the radiator cap. |
- Insufficient coolant or leakage.
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- After refilling coolant, recheck.
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| KDS Check & Starting engine |
- Check DTCs
- 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.
- Replace the components.
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| Remove the thermostat and inspect |
- Check if there are dusts or chips in the thermostat valve.
- Check adherence of the thermostat.
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- Clean the thermostat valve and reuse the thermostat.
- Replace the thermostat, if it doesn't work properly.
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| Heated excessively |
- Engine overheated
- Temperature gauge indicates 'HI'
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Visually check after removing the radiator cap. |
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- After refilling coolant, recheck.
- Check the cylinder head gaskets for damage and the tightening torque of the mounting bolts.
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| KDS Check & Starting 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.
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- 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.
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| Immerse the thermostat in boiling water and inspection. |
- After removing the thermostat, check it works properly.
Check the thermostat opens at the valve opening temperature. |
- Replace the thermostat, if it doesn't work properly.
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