Kia Optima: Inspection - Thermostat. Repair procedures - Cooling System - Engine Mechanical System - Kia Optima TF 2011-2020 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 1.5C (179.6 2.7F)

Full opening temperature: 95C (203F)


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 95C (203F)
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:

ENGINE START/STOP button position
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Components and Components Location
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