Kia Optima Hybrid: Cooling System / Water pump Troubleshooting

Troubleshooting
Symptoms
Possible Causes
Remedy
Coolant leakage
From the bleed hole of the water pump
Visually check
Check leaks after about ten-minute warming up.
If coolant still leaks, replace a water pump.
If leakage stops, reuse the water pump (Do not replace the pump with a new one).
From gaskets or bolts
Check the tightening of the water pump mounting bolts.
Retighten the mounting bolts.
Check damage of gaskets or inflow of dust.
Replace the gasket and clean dust off.
From outer surface of water pump
Check the material or any cracks of the water pump.
Poor material. If any crack found, replace the water pump.
Noise
From bearings
From mechanical seals
Impeller interference
Inspection with a stethoscope
After starting the engine, check noise with a stethoscope.
If there is no noise, reuse the water pump (do not replace it).
If there is any noise from the water pump, remove the drive belt and recheck.
Inspection after removing a drive belt
After removing a water pump and a drive belt, check noise again.
If there is noise, reuse the water pump. Check other drive line parts.
If there is no noise, replace the water pump with a new one.
Inspection after removing a water pump
After removing a water pump and a drive belt, check noise again.
If there is any interference between them, replace the water pump with a new one.
Overheating
Damaged impeller
Loosened impeller
Loosened impeller
Corrosion of the impeller wing
Check engine coolant.
Poor coolant quality / Maintenance check
Impeller seperation from the shaft
Replace the water pump.

Water pump Repair procedures

Removal and Installation 1. Loosen the drain plug, and then drain the engine coolant. Remove the radiator cap to help drain the coolant faster. 2. Remove the water pump drive belt (A). (1) Put the SST ...

Thermostat Repair procedures

Removal and Installation     Disassembly of the thermostat would have an adverse effect, causing a lowering of cooling efficiency. Do not remove the thermostat, even if the engine tends to overheat. ...

Other information:

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Temperature Control Actuator Description and Operation


Description 1. Heater unit includes mode control actuator and temperature control actuator. 2. Temperature control actuator is located at the heater unit. It regulates the temperature by the procedure as follows. Signal from control unit adjusts position of temperature door by operating temperature switch ...

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual: Blind Spot Detection Switch Repair procedures


Removal 1. Disconnect the negative (-) battery terminal. 2. Remove the crash pad lower panel. (Refer to the BD group - "Crash pad") 3. Remove the crash pad side switch assembly (A) as shown below picture.     Wear globes to protect hands from injury. 4. Remove the crash pad lower switch assembly ...

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