Kia Forte: Cooling System / Thermostat

Kia Forte 2019-2020 (BD) Service Manual / Engine Mechanical System / Cooling System / Thermostat

Components and components location
Components

1. Water inlet fitting
2. Thermostat

Repair procedures
Removal
  

Disassembly of the thermostat would have an adverse effect, causing a lowering of cooling efficiency.

1.

Drain the engine coolant.

(Refer to Cooling System - "Coolant")

2.

Remove the radiator lower hose (A).

3.

Remove the water inlet fitting (A).

Tightening torque :

18.6 - 23.5 N·m (1.9 - 2.4 kgf·m, 13.7 - 17.4 lb·ft)

4.

Remove the thermostat (A).

5.

Install in the reverse order of removal.

  

Place the thermostat with the jiggle valve (A) upward.

6.

Fill with the engine coolant.

(Refer to Cooling System - "Coolant")

7.

Start engine and check for leaks.

Inspection
1.

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.

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 : 8 mm (0.3 in.) or more at 100°C (212°F)

If the valve lift is not as specified, replace the 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.

KDS 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.

KDS 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.


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