Hyundai Tucson: Troubleshooting

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

Trouble Symptom

Coolant leakage

  • From the bleed hole of the water pump
  • From gaskets or bolts
  • From outer surface of water pump

Probable Cause

Visually check

  1. Check leaks after about ten-minute warming up.
  • If coolant still leaks, replace a water pump.
  • If leakage stops, reuse the water pump (Do not replace the pump with a new one).


Be careful not to misrepair because evaporite sediment caused by tiny vapor evaporation or a little coolant evaporation evidence can happen even when the water pump operates normal.

  • Get rid of sediment in the air hole, and recheck there is leakage or not.
  1. Check the tightening of the water pump mounting bolts.
  • Retighten the mounting bolts.
  1. Check damage of gaskets or inflow of dust.
  • Replace the gasket and clean dust off.
  1. Check the material or any cracks of the water pump.
  • Poor material. If any crack found, replace the water pump.

Trouble Symptom


  • From bearings
  • From mechanical seals
  • Impeller interference

Probable Cause

Inspection with a stethoscope

After starting the engine, check noise with a stethoscope.

  • If there is no noise, reuse the water pump (do not replace it).
  • If there is any noise from the water pump, remove the drive belt and recheck.

Inspection after removing a drive belt

After removing a water pump and a drive belt, check noise again

  • If there is noise, reuse the water pump. (Check other drive line parts)
  • If there is no noise, replace the water pump with a new one.

Inspection after removing a water pump

Check water pump body and impeller interference.

  • If there is any interference between them, replace the water pump with a new one.

Trouble Symptom


  • Damaged impeller
  • Loosened impeller

Loosened impeller

  1. Corroded impeller insert
  2. Replace the water pump if it is separated by corrosion between impellers and inserts
  3. Replace the water pump if there is a crack in the PL impeller.
  • Check engine coolant.
  • Poor coolant quality / Maintenance check
  1. Impeller seperated from the shaft
  • Replace the water pump.

Overheat warning lamp

Excessive Coolant Temperature

Obstruction of radiator by foreign matter Check the front of the condenser/radiator inside the bumper for contamination by debris.

  • Clean the radiator


  1. Remove the engine room under cover.

(Refer to Engine and Transaxle Assembly - "Engine Room Under Cover")

  1. Drain the coolant

(Refer to Cooling System - "Coolant")

  1. Remove the drive belt.

(Refer to Drive Belt System - "Drive Belt")

  1. Remove the water pump pulley (A).

Tightening torque : 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

  1. Remove the water pump (A) with a gasket.

Tightening torque : 11.8 - 13.7 N.m (1.2 - 1.4 kgf.m, 8.7 - 10.1 lb-ft)

  1. Install in the reverse order of removal.


  • Always use new water pump gasket.
  • Check the specifications of the water pump instaling bolts. (Make sure that a solid sealant is applied to the thread of the bolt.)
  • Always use new water pump bolts.
  • Remove the sealant residue inside the bolt tap hole.
  • When installing the water pump, tighten the bolts in the order shown in the figure below.

  • Before installing the water pump, remove the hardened sealant, foreign matters, oil, dust, water, etc.

    off the inside hole (A) where the bolt is installed.

  1. Fill with engine coolant.

(Refer to Cooling System - "Coolant")


The coolant must be injected according to the integrated thermal management module (ITM) coolant filling method.

  1. Start engine and check for leaks.


The AAF (Active Air Flap) is located between radiator grille and radiator.The AAF controls the motor properly and then the air flaps adjust air flow from the radiator grille.

During high speed driving, it will reduce the air resistance by closing the air flaps. This improves the fuel efficiency and enhances the driving stability. If the engine is overheated, the system will open the air flaps to drop the temperature.During the A/C operation, the system will open the air flaps to maintain the refrigerant pressure. The system will close the air flaps to warm up the engine rapidly during cold start.


     Active Air Flap(AAF)

    Remove the front bumper. (Refer to Body (Interior and Exterior) - "Front Bumper Cover") Disconnect the active air flap connector (A). RH LH Remove the active air flap (A) after loosening the mounting screws. RH

     Active Air Flap (AAF) Actuator

    Remove the front bumper. (Refer to Body (Interior and Exterior) - "Front Bumper Cover") Disconnect the active air flap connector (A). RH LH Remove the active air flap actuator (A) after loosening the mounting screw

     Cylinder Block


     General Troubleshooting

    Information Before Troubleshooting Check applicable fuses in the appropriate fuse/relay box. Using the battery checker (MCR-570 KIT), check the battery for damage, state of charge, and clean and tight connections. (Refer to Engine Elect

     Power Door Locks

    Front Door Lock Module Inspection Inspection Remove the front door trim. (Refer to Body - "Front Door Trim") Disconnect the connectors from the actuator. Check actuator operation by connecting power and ground according to the