Hyundai Elantra: Cooling System / Troubleshooting

Hyundai Elantra (CN7) 2021-2025 Service Manual / Engine Mechanical System / Cooling System / Troubleshooting

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.

•	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.

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 O-ring.

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.

•	Will not operate in cold ambient temperature.

Diagnostic device

Inspect self-diagnostic code using diagnostic tool.

Check coolant temperature sensor, wiring, connector, etc.

Unit inspection

Inspect water pump impeller.

Replace water pump.

Components and components location

Components1. Water pipe2. Water hose3. Integrated thermal management module (ITM)4. Heater pipe5. Turbo charger coolant hose6. Heater hose7. Heater pipe A8...

Coolant

Repair procedures Replacement and Air Bleeding • Never remove the reservoir tank cap when the engine is hot...

Other information:

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Rear center seat belt

When using the rear center seat belt, the buckle with the “CENTER” mark must be used.

WARNING

Make sure that the seatback is locked in place when using the rear center seat belt.

If not, the seatback may move when there is a sudden stop or collision, which could result in serious injury.