Hyundai Genesis: Cooling System / Thermostat Repair procedures

Removal and Installation
Removal of the thermostat will have an adverse effect, leading to lowered cooling efficiency.
Do not remove the thermostat, even if the engine tends to overheat.
Disconnect the battery "-" terminal from the trunk room.
Drain engine coolant so its level is below thermostat.
(Refer to Cooling System - "Coolant")
Remove the water inlet pipe.
(Refer to Cooling System - "Water Temperature Control Assembly")
Remove the coolant inlet fitting (A).

Tightening torque :
7.8 ~ 11.8 N.m (0.8 ~ 1.2 kgf.m, 5.8 ~ 8.7 lb-ft)

Remove the thermostat (A).

Install the thermostat with the jiggle valve facing upward.
To install, reverse the removal procedure.
Immerse the thermostat in water and gradually heat the water.

Check the valve opening temperature.

Valve opening temperature: 88 ± 2°C (190.4±3.6°F)
Full opening temperature: 100°C (212°F)

If the valve opening temperature is not as specified, replace the thermostat.
Check the valve lift.

Valve lift : 10 mm (0.3937 in.) or more at 100°C (212°F)

If the valve lift is not as specified, replace the thermostat.
Thermostat Components and Components Location
Components 1. Water temperature control Assembly2. Thermostat3. Coolant inlet fitting ...

Thermostat Troubleshooting
Troubleshooting SymptomsPossible CausesRemedyCoolant leakage • From the thermostat gasket Check the mounting bolts • Check the torque of the mounting bolts • Retighten the bo ...

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