Kia Cee'd: Cooling System / Thermostat Troubleshooting

Troubleshooting
 
Symptoms
Possible Causes
Remedy
Coolant leakage
From the thermostat gasket
Check the mounting bolts
Check the torque of the mounting bolts
Retighten the bolts and check leakage again.
Check the gasket for damage
Check gasket or seal for damage
Replace gaskets and reuse the thermostat.
Cooled excessively
Low heater performance (cool air blowed-out)
Temperature gauge indicates 'LOW'
Visually check after removing the radiator cap.
Insufficient coolant or leakage.
After refilling coolant, recheck.
GDS check&Starting engine
Check DTCs
Check connection of the fan clutch or the fan motor.
※ If the fan clutch is always connected, there will be a noise at idle.
Check the engine coolant sensor, wiring and connectors.
Replace the componants.
Remove the thermostat and inspect
Check if there are dusts or chips in the thermostat valve.
Check adherence of the thermostat.
Clean the thermostat valve and reuse the thermostat.
Replace the thermostat, if it doesn't work properly.
Heated excessively
Engine overheated
Temperature gauge indicates 'HI'
Visually check after removing the radiator cap.
Insufficient coolant or leakage.
※ Be careful when removing a radiator cap of the overheated vehicle.
Check air in cooling system.
After refilling coolant, recheck.
Check the cylinder head gaskets for damage and the tightening torque of the mounting bolts.
GDS check&Starting engine
Check DTCs
Check the fan motor performance as temperature varies.
Check if the fan clutch slips.
Check the water pump adherence or impeller damaged.
Check the engine coolant sensor, wiring and connectors.
Check the fan motor, the relay and the connector.
Replace the fan clutch, if it doesn't work properly.
Replace the water pump, if it doesn't work properly.
Immerse the thermostat in boiling water and inspection.
After removing the thermostat, check it works properly.
※ Check the thermostat opens at the valve opening temperature.
Replace the thermostat, if it doesn't work properly.

Thermostat Repair procedures
Removal    Disassembly of the thermostat would have an adverse effect, causing a lowering of cooling efficienc ...

Lubrication System
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Other information:

Kia Cee'd JD Owners Manual: Operating conditions
To operate: Press the BSD switch with the Ignition switch in the ON position. The indicator on the BSD switch will illuminate. When the vehicle speed exceeds 30 km/h (20 mph), the system will be activated. To cancel: Press the BSD switch again. The indicator on the switch will go off. W ...

Kia Cee'd JD Owners Manual: Owner maintenance schedule
When you stop for fuel: Check the engine oil level. Check coolant level in coolant reservoir. Check the windshield washer fluid level. Look for low or under-inflated tires. Check the radiator and condenser. Check if the front of the radiator and condenser are clean and not block ...

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