Kia Optima: Inspection

1.	Immerse the thermostat in water and gradually heat the water.

Check the valve opening temperature.

Valve opening temperature: 82 ± 1.5°C (179.6 ± 2.7°F)

Full opening temperature: 95°C (203°F)

If the valve opening temperature is not as specified, replace the thermostat.

Check the valve lift.

Valve lift : 8mm (0.3in.) or more at 95°C (203°F)

If the valve lift is not as specified, replace the thermostat.

Disassembly of the thermostat would have an adverse effect, causing a lowering of cooling efficiency. Do not remove the thermostat, e ...

Troubleshooting Symptoms Possible Causes Remedy Coolant leakage • From the thermostat gasket ...

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