Hyundai Ioniq (AE): Cooling System / Thermostat. Repair procedures

Hyundai Ioniq (AE) 2017-2022 Service & Repair Manual / 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.
1.
Drain the engine coolant so its level is below thermostat.
(Refer to Cooling System - "Coolant")
2.
Disconnect the radiator lower hose (A).

   
•
When installing radiator hoses, install as shown in illustrations.

   
•
When the radiator lower hose detached, remove the holder clip (A) and then disconnect the quick connector.

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).

   
•
Install the thermostat with the jiggle valve upward.
5.
Install in the reverse order of removal.
6.
Fill the radiator with coolant and check for leaks.
(Refer to Cooling System - "Coolant")
7.
Start engine and check for leaks.
8.
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 : 88 ± 1.5°C (190.4 ± 2.7°F)
Full opening temperature : 100°C (212°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.

    Components1. Water inlet fitting2. Thermostat

    Troubleshooting Symptoms Possible Causes Remedy Coolant leakage• From the thermostat gasketCheck the mounting bolts• Check the torque of the mounting bolts• Retighten the bolts and check leakage again.

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