Hyundai Palisade Quiz
Engine Mechanical System

Electric Thermostat (ECT)

In this manual: Engine Mechanical System
General Information — 10Engine Mechanical System — 56Engine Electrical System — 28Emission Control System — 21Engine Control System/Fuel System — 42Automatic Transmission System (A8LF1) — 33All-Wheel Drive (AWD) System — 16Drive Shaft and Axle — 19Suspension System — 28Steering — 17Restraints — 20Brake System — 39Body (Interior and Exterior) — 142Body Electrical System — 171Heating, Ventilation, and Air Conditioning — 47Advanced Driver Assistance System (ADAS) — 44
13steps
~78min
3/5difficulty
0102030405019.614N·mlb·ft
Tightening torque found on this page
Done 0 of 13

Description and Operation

Description and Operation

Electric Thermostat (ECT) Overview: Optimal control of coolant temperature according to driving conditions
Hyundai Palisade. Description and operation
Operating 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 parts located under the vehicle (floor under cover, fuel filter, fuel tank, and canister) when lifting the vehicle with a lift. (Refer to General Information - Jack Lifting Points and Support Points)
Hyundai Palisade. Repair procedures
  • Removing the thermostat may have adverse effects, causing reduced cooling efficiency. Do not remove the thermostat, even if the engine tends to overheat.
  1. Disconnect the negative battery cable.
  2. Remove the engine cover. (Refer to Engine and Transaxle Assembly - Engine Cover)
  3. Drain the engine coolant. (Refer to Cooling System - "Engine 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

    Hyundai Palisade. Repair procedures
  7. Install in the reverse order of removal.
  8. Fill the engine with engine coolant. (Refer to Cooling System - "Engine Coolant")
  9. Start the engine and check for leaks.
  10. Recheck the coolant level.

Inspection

  1. Immerse the thermostat in water heated above 95 °C, then heat for at least 3 minutes to check valve lift.
    Hyundai Palisade. Repair procedures
    Hyundai Palisade. Repair procedures
    • Do not immerse the connecting part.
  2. Check the valve opening temperature. Valve opening temperature: 100 ± 2 °C (212 ± 3.6 °F). Full open temperature: 113 °C. If the valve opening temperature does not meet the specification, replace the thermostat.
  3. Check the valve lift.

    Valve lift: 8 mm (0.3150 in) or more at 113 °C

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

Troubleshooting

Troubleshooting

Symptom of Malfunction Probable Cause Remedy
Coolant Leakage
  • From the thermostat gasket
 Check the mounting bolts
  • Check the tightening torque of the mounting bolts
  • Tighten the bolts and check for leaks again.
Check the gasket for damage
  • Check the gasket or seal for damage
  • Replace the gaskets and reuse the thermostat.
Excessive cooling
  • Insufficient heater output (cold air blows out)
  • Temperature gauge reads "LOW"
 Visually check after removing the radiator cap.
  • Insufficient coolant or leakage.
  • After adding coolant, repeat the check.
GDS Check and Engine Start
  • Check the diagnostic trouble codes
  • Check the connection of the fan clutch or fan motor.
※ If the fan clutch is always engaged, noise will be heard at idle.
  • Check the engine coolant temperature sensor, wiring and connectors.
  • Replace the components.
Remove the thermostat and inspect.
  • Check for dust or debris in the thermostat valve.
  • Check the thermostat seating.
  • Clean the thermostat valve and reuse the thermostat.
  • Replace the thermostat if it does not operate properly.
Overheating
  • Engine Overheated
  • Temperature gauge indicates "HI".
 Visually check after removing the radiator cap.
  • Insufficient coolant or leakage. ※Be careful when removing the radiator cap on an overheated vehicle.
  • Check for air in the cooling system.
  • After adding coolant, repeat the check.
  • Check the cylinder head gasket for damage and the tightening torque of the mounting bolts.
GDS Check and Engine Start
  • Check the diagnostic trouble codes
  • Check the operation of the fan motor as the temperature changes.
  • Check whether the fan clutch is slipping.
  • Check the water pump fit and impeller for damage.
  • Check the engine coolant temperature sensor, wiring and connectors.
  • Check the fan motor, relay and connector.
  • Replace the fan clutch if it does not operate properly.
  • Replace the water pump if it does not operate properly.
Immerse the thermostat in boiling water and inspect it.
  • After removing the thermostat, check its operation. ※ Make sure the thermostat opens at the valve opening temperature.
  • Replace the thermostat if it does not operate properly.

Test yourself

A quick Hyundai Palisade quiz: every answer comes with an explanation and a link to the manual page.