Hyundai Tucson: Engine Overheat/ Troubleshooting

Hyundai Tucson - Fourth generation (NX4) - (2020-2023) - Workshop Manual / Engine Mechanical System / Cooling System / Engine Overheat/ Troubleshooting


  1. Water pipe
  2. Water hose
  3. Integrated thermal management module (ITM)
  4. Heater pipe
  5. Turbo charger coolant hose
  6. Heater hose
  7. Heater pipe A
  8. Heater pipe A gasket
  9. Oil cooler hose A
  10. Oil cooler pipe
  11. Oil cooler hose B
  12. Water inlet fitting
  13. Water inlet fitting O-ring

Engine Overheat/ Troubleshooting

Visual inspection

Inspection/ Remedy

  • Inspect for shortage of coolant in reservoir tank ./ Reinspect after replenishing coolant.
  • Inspect for coolant pollution after removing radiator cap.


Be careful when removing radiator cap from overheated vehicle. /  Reinspect after replacing coolant.

  • Inspect for leakage and loose coolant hoses (radiator hose, heater hose, oil cooler hose, etc.)./ Reinspect for leakage after reinstalling hoses and clamps.
  • Checking for coolant leaks of Integrated Thermal Management Module (ITM)/ Replace O-ring or replace the integrated thermal management module (ITM) if required
  • Inspecting the heater pipe connection to find coolant leaks./ Reinspect for leakage after reinstalling hoses and clamps.
  • Inspect for leakage on water inlet fitting mounting part./
  • Reinspect for leakage after replacing Oring.
  • Reinspect for leakage after tightening to the specified torque.
  • Inspect drive belt (for normal operation of water pump)./ Adjust drive belt tension or replace.
  • Inspect for leakage on water pump gasket mounting part./
  • Reinspect for leakage after replacing gasket.
  • Reinspect for leakage after tightening to the specified torque.
  • Inspect for loose coolant temperature sensor, cooling fan connector and pin/
  • Reinstall loose connector.
  • Replace relevant part if connector pin is damaged.
  • Inspect operation status of cooling fan.

    Check operation status by switching ON/OFF the heater control A/C.


Will not operate in cold ambient temperature./ Check mounting status of ground cable.

Diagnostic device

Inspection/ Remedy

  • Inspect self-diagnostic code using diagnostic tool./ Check coolant temperature sensor, wiring, connector, etc.

Unit inspection

Inspection/ Remedy

  • Inspect water pump impeller./ Replace water pump.


     Replacement and Air Bleeding

    WARNING Never remove the reservoir tank cap when the engine is hot. Serious scalding could be caused by hot fluid under high pressure escaping from the radiator. WARNING When pouring engine coolant, be sure to shut the relay box lid and n

     Cooling Fan Assembly

    Components Cooling fan Fan motor Cooling fan shroud Cooling Fan Assembly Disconnect the negative battery terminal. Remove the radiator. (Refer to Cooling System - "Radiator") Remove the cooling fan (A) from the rad

     Fan motor

    Turn ignition switch "OFF" and connect the diagnostic tool to the Data Link Connector. With the gear shift in P (Park) position and ignistion switch "ON" (LED of the Power button illuminates in Red), select the "fo


     Height adjust

    Component Location Height adjust Replacement Remove the front seat belt upper anchor. (Refer to Front Seat Belt - "Front Seat Belt Pretensioner") After loosening the mounting bolts, then remove the height adjust (A). T

     Brake Pedal

    Components Brake member assembly Stop lamp switch Brake pedal arm assembly Brake pedal pad Schematic Diagram System circuit diagram Terminal Function Adjustment Turn ignition switch OFF and disconnect the negat