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 ± 1.5°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:

Engine compartment
2.4L Engine 2.0L Engine * The actual engine room in the vehicle may differ from the illustration. 1. Engine coolant reservoir 2. Engine oil filler cap 3. Brake/clutch fluid reservoir ...

Parking Brake and Brake Fluid Warning
Parking Brake Warning This light comes ON when the parking brake is applied with the ignition switch in the START or ON position. The warning light should go off when the parking brake is release ...

Hazard warning flasher
Type A Type B The hazard warning flasher should be used whenever you find it necessary to stop the car in a hazardous location. When you must make such an emergency stop, always pull off the ...

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