Engine Mechanical

cooling system

~2min read

Components and Components Location

COMPONENTS LOCATION

1. Oil cooler
2. Cooling fan assembly
3. Upper radiator hose
4. Lower radiator hose
5. Coolant line and hose
6. Expansion tank hose
7. Expansion tank
8. Radiator lower support [RH]
9. Radiator lower support [G]

Troubleshooting

Engine Overheats

TEST Measurement
VISUAL INSPECTION Check the coolant level in the expansion tank. Add coolant and check again.
Remove the radiator cap and check the coolant for contamination.
Replace the coolant and check again.
Check for leaks and loose coolant hose clamps (radiator hose, heater hose, oil cooler hose, etc.). Check again after reinstalling hoses and clamps.
Check the water inlet housing for leaks. After replacing the O-ring, check for leaks again.
Check again after tightening to the specified torque.
Inspect the drive belt (for proper operation of the coolant pump). Adjust the drive belt tension or replace the drive belt.
Check the coolant pump assembly seal for leaks. After replacing the gasket, check for leaks again.
Check again after tightening to the specified torque.
Check the loose coolant temperature sensor, cooling fan connector and terminal. Connect the loose connector correctly.
If the connector terminal is damaged, replace the relevant part.
Check the cooling fan operation.
- Check operation by turning the A/C heater control on and off.
Check the ground cable installation distance.
diagnostic scan tool Check the self-diagnosis code using KDS/GDS. Check the coolant temperature sensor, wiring, connectors, etc.
Component Inspection Check the coolant pump impeller. Replace the coolant pump.
Check for debris and the condition of the thermostat. Check the assembly after removing foreign matter.
Check the thermostat for sticking.
- Immerse the thermostat in water above 95 °C and let it heat for at least 3 minutes to check valve lift.
Check the valve lift.
- If valve lift is below specification or the valve is stuck, replace the thermostat.

Test yourself

A quick Kia Stonic quiz: every answer comes with an explanation and a link to the manual page.