Kia Optima: Engine Mechanical System / Cooling System

Kia Optima DL3 2019-2024 Service and Repair Manual / Engine Mechanical System / Cooling System

Troubleshooting
Engine Overheat Troubleshooting

Inspection
Remedy
Visual inspection
Inspect for shortage of coolant in reservoir tank .
Reinspect after replenishing coolant.
Inspect for coolant pollution after removing reservoir tank cap.
  

Be careful when removing reservoir tank cap from overheated vehicle.

Reinspect after replacing coolant.
Inspect for leakage and loose coolant hoses (radiator hose, heater hose, oil cooler hose, etc.).
Reinspect for leakage after reinstalling hoses and clamps.
Inspect for leakage on water inlet fitting mounting part.
Reinspect for leakage after replacing O-ring.
Reinspect for leakage after tightening to the specified torque.
Inspect drive belt (for normal operation of water pump).
Adjust drive belt tension or replace.
Inspect for leakage on water pump gasket mounting part.
Reinspect for leakage after replacing gasket.
Reinspect for leakage after tightening to the specified torque.
Inspect for loose coolant temperature sensor, cooling fan connector and pin.
Reinstall loose connector.
Replace relevant part if connector pin is damaged.
Inspect operation status of cooling fan.
- Check operation status by switching ON/OFF the heater control A/C.
  

Will not operate in cold ambient temperature.

Check mounting status of ground cable.
Diagnostic device
Inspect self-diagnostic code using KDS.
Check coolant temperature sensor, wiring, connector, etc.
Unit inspection
Inspect water pump impeller.
Replace water pump.
Inspect for foreign materials and status of thermostat valve.
Inspect unit after removing foreign materials.
Inspect for stuck thermostat valve.
- Immerse thermostat in water heated to over 95°C (203°F), then heat for at least 3 minutes to check valve lift.
  

Do not use water below 95°C (203°F).

Do not directly heat unit as this will damage thermostat.

Check valve lift.
- Replace thermostat if valve lift is below specification or valve is stuck.

Engine Mechanical System
Special service tools Special Service Tools Tool Name / Number Illustration Description Crankshaft front oil seal installer 092 ...

Coolant
Repair procedures Refilling And Bleeding    Never remove the reservoir tank cap when the engine is hot. Serious scaldin ...

Other information:

Kia Optima DL3 2019-2024 Owner's Manual: To set cruise control speed


1. Press the CRUISE button on the steering wheel to turn the system on. The CRUISE indicator light in the instrument cluster will illuminate. 2. Accelerate to the desired speed, which must be more than 30 km/h (20 mph). 3. Move the lever down (to SET-), and release it at the desired speed. T ...

Kia Optima DL3 2019-2024 Owner's Manual: Low Tire Pressure Warning Light


This warning light illuminates: Once you set the ignition switch or Engine Start/Stop Button to the ON position. - It illuminates for approximately 3 seconds and then goes off. When one or more of your tires are significantly underinflated. ❈For more details, refer to “Tire Pressure ...

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