| SONATA(YF) >2013 > G 2.4 GDI > Engine Mechanical System > Cooling System > 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.

1. | Drain engine coolant so its level is below thermostat.

2. | Disconnect the radiator lower hose (A).

3. | Remove water inlet fitting (C), gasket (B) and thermostat (A).

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

4. | Installation is reverse order of removal.

Install the thermostat with the jiggle valve upward.

5. | Fill the engine coolant.

6. | Start the engine and check for leaks.

7. | Recheck the coolant level.

Inspection

1. | Immerse the thermostat in water and gradually heat the water.

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 : 8mm (0.3in.) or more at 95°C (203°F)

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