Hyundai Palisade: Cooling System / Electric Thermostat (ECT)

Hyundai Palisade (LX2) 2020-2025 Service Manual / Engine Mechanical System / Cooling System / Electric Thermostat (ECT)

Description and operation
Description and Operation
Electric Thermostat (ECT)
Overview
Optimal control of coolant temperature depending on the driving conditions

Hyundai Palisade. Description and operation

Operation Principle

Hyundai Palisade. Description and operation

Electric Thermostat (ECT) Structure

Hyundai Palisade. Description and operation

Repair procedures
Removal
Hyundai Palisade. Repair procedures   
•
Be careful not to damage the parts located under the vehicle (floor under cover, fuel filter, fuel tank and canister) when raising the vehicle using the lift.
(Refer to General Information - "Lift and Support Points")
Hyundai Palisade. Repair procedures   
•
Removal of the thermostat may have an adverse effect, causing a reduction in cooling efficiency. Do not remove the thermostat, even if the engine tends to overheat.
1.
Disconnect the battery negative terminal.
2.
Remove the engine room under cover.
(Refer to Engine and Transaxle Assembly - "Engine Room Under Cover")
3.
Drain engine coolant.
(Refer to Cooling System - "Coolant")
4.
Disconnect the radiator lower hose (A).

Hyundai Palisade. Repair procedures
5.
Disconnect the electric thermostat (ECT) connector (A).

Hyundai Palisade. Repair procedures
6.
Remove the electric thermostat (ECT) and water inlet fitting assembly (A).
Tightening torque :
16.7 - 19.6 N.m (1.7 - 2.0 kgf.m, 12.3 - 14.5 lb.ft)

Hyundai Palisade. Repair procedures
7.
Install in the reverse order of removal.
8.
Fill the engine coolant.
(Refer to Cooling System - "Coolant")
9.
Start the engine and check for leaks.
10.
Recheck the coolant level.
Inspection
1.
Immerse thermostat in water heated to over 95°C (203°F), then heat for at least 3 minutes to check valve lift.

Hyundai Palisade. Repair procedures

Hyundai Palisade. Repair procedures   
•
Do not immerse connector part.
2.
Check the valve opening temperature.
Valve opening temperature:
100 ± 2°C (212±3.6°F)
Full opening temperature: 113°C (235°F)
If the valve opening temperature is not as specified, replace the thermostat.
3.
Check the valve lift.
Valve lift : 8 mm (0.3150 in.) or more at 113°C (235°F)
If the valve lift is not as specified, replace the thermostat.
Troubleshooting
Troubleshooting
Trouble Symptom
Probable Cause
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)
•
Thermogauge indicates 'LOW'
Visually check after removing the radiator cap.
•
Insufficient coolant or leakage.
•
After refilling coolant, recheck.
Check GDS & engine start
•
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 components.
Remove the thermostat and inspect
•
Check if there are dust 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
•
Thermogauge indicates 'HI'
Visually check after removing the radiator cap.
•
Insufficient coolant or leakage.
※Be careful when removing the 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.
Check GDS & engine start
•
Check DTCs
•
Check the fan motor performance as temperature varies.
•
Check if the fan clutch slips.
•
Check for water pump adherence and damaged impeller.
•
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 inspect.
•
After removing the thermostat, check if 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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