KIA Niro: Cooling System

Components

  1. Reservoir tank
  2. Reservoir hose & pipe
  3. Radiator
  4. Radiator upper hose
  5. Radiator lower hose
  6. Radiator upper mounting bracket (RH)
  7. Radiator upper mounting bracket (LH)
  8. Radiator lower mounting insulator (RH)
  9. Radiator lower mounting insulator (LH)
  10. Cooling fan assembly 11. Air dam

Engine Overheat Troubleshooting

Inspection : → Remedy

Visual inspection

Inspect for shortage of coolant in reservoir tank .

Reinspect after replenishing coolant.

Inspect for coolant pollution after removing radiator cap. → Reinspect after replacing coolant.

Warning

Be careful when removing radiator cap from overheated vehicle.

Inspect for leakage and loose coolant hoses (radiator hose, heater hose, oil cooler hose, etc.).  → 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. → Check mounting status of ground cable.

Warning

Will not operate in cold ambient temperature.

Inspection : → Remedy

Diagnostic device

Inspect self-diagnostic code using KDS. → Check coolant temperature sensor, wiring, connector, etc.

Inspection : → Remedy

Unit inspection

Inspect water pump impeller. →Replace water pump.

Inspect for foreign materials and status of thermostat valve. → Inspect unit after removing foreign materials.

Inspect for stuck thermostat valve.

  • Immerse thermostat in water heated to over 95°C (203°F), then heat for at least 3 minutes to check valve lift. → 

    Check valve lift.

  •  Replace thermostat if valve lift is below
    specification or valve is stuck.

Warning

  • Do not use water below 95°
    C (203°F).

  • Do not directly heat unit as
    this will damage thermostat.

READ NEXT:

 Coolant Repair procedures

Warning Never remove the radiator 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, shut the relay box lid and be careful not to spil

 Cooling Fan Repair procedures | Cooling Fan Assembly

Cooling Fan Components and components location Components Cooling fan Cooling fan motor Cooling fan shroud Air dam Cooling fan controller (PWM) Description Controls the cooling fan motor voltage depending on the duty

SEE MORE:

 Connector Inspection Procedure

Handling of Connector a. Never pull on the wiring harness when disconnecting connectors. b. When removing the connector with a lock, press or pull locking lever. c. Listen for a click when locking connectors. This sound indicates that

 Measuring insulation resistance using an insulation tester

Warning Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries. Be sure to

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