Kia Optima: Inspection - Thermostat. Repair procedures - Cooling System - Engine Mechanical System - Kia Optima TF 2011-2024 Service ManualKia Optima: Inspection

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

2. 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.
3. 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.

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

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

See also:

Variable Intermittent Wipers
Set the lever to the INT position and choose the desired wiper interval by turning the ring. ...

Changing Coolant
Change coolant according to the Scheduled Maintenance. Use only soft (de-mineralized) water in the coolant mixture. The engine in your vehicle has aluminum engine parts and must be protected ...

Turbo Charger. Components and Components Location
Components   1. Turbine housing 2. Turbine inlet 3. Turbine outlet 4. Compressor housing 5. Compressor inlet 6. Compressor outlet 7. Center housing 8 ...

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