Hyundai Elantra: Cooling System / Electric Thermostat (ECT) 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.
Thermostat
1.
Drain engine coolant so its level is below thermostat.
(Refer to Cooling System - "Coolant")
2.
Disconnect the Radiator lower hose quick connector (A).

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

3.
Remove the water inlet fitting and thermostat (A).

Tightening torque :
18.6 ~ 23.5 N.m (1.9 ~ 2.4 kgf.m, 13.7 ~ 17.4 lb-ft)

4.
Install in the reverse order of removal.
   
Install the thermostat with the jiggle valve upward.
When assembling the thermostat, place the thermostat on the housing with a protrusion of thermostat matching with a groove of the housing and install the inlet fitting. Be careful the thermostat doesn’t get out of the groove on the housing.
Clean surface on the rubber packing contact surface.
5.
Fill the engine coolant.
(Refer to Cooling System - "Coolant")
6.
Start the engine and check for leaks.
7.
Recheck the coolant level.
Heater Pipe
1.
Remove the intake manifold.
(Refer to Intake and Exhaust System - "Intake Manifold")
2.
Disconnect the bypass hose (A).

3.
Unfasten the heater pipe mounting bolts (A) and then remove the heater pipe.

Tightening torque :
19.6 ~ 23.5 N.m (2.0 ~ 2.4 kgf.m, 14.5 ~ 17.4 lb-ft)

   
Do not reuse the seal bolts.
4.
Install in the reverse order of removal.
5.
Fill the engine coolant.
(Refer to Cooling System - "Coolant")
6.
Start the engine and check for leaks.
7.
Recheck the coolant level.
Inspection
Thermostat
1.
Immerse the only thermostat part in water and gradually heat the water.

   
Don’t immerse connector part.
2.
Check the valve opening temperature.
If the valve opening temperature is not as specified, replace the thermostat.

Valve opening temperature:
100 ± 2°C (212 ± 35.6°F)
Full opening temperature: 115°C (239°F)

3.
Check the valve lift.
If the valve lift is not as specified, replace the thermostat.

Valve lift : 8 mm (0.3 in.) or more at 115°C (239°F)

Electric Thermostat (ECT) Components and Components Location
Components 1. Water inlet fitting & Thermostat2. Bypass hose3. Heater pipe & hose assembly ...

Electric Thermostat (ECT) Troubleshooting
Troubleshooting SymptomsPossible CausesRemedyCoolant leakage • From the thermostat gasket Check the mounting nuts • Check the torque of the mounting nuts • Retighten the bolt ...

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