2024 Hyundai Elantra Coolant Leak TSB: ITM Module Port

Certain 2024 Hyundai Elantra (CN7) vehicles equipped with a 2.0L engine may develop a Hyundai Elantra coolant leak from the Heat Exchange Port located on the Integrated Thermal Management (ITM) Module assembly. This issue can lead to coolant loss and potential engine overheating if not addressed.

Symptoms

Owners may notice a Hyundai Elantra coolant leak originating from the Integrated Thermal Management (ITM) Module assembly. This would typically manifest as visible coolant puddles under the vehicle or a noticeable drop in the coolant reservoir level.

Diagnosis / Trigger Conditions

Diagnosis involves a visual inspection for coolant leaks around the Heat Exchange Port of the ITM Module assembly. Technicians will confirm the source of the leak to determine if the Heat Exchange Port requires replacement as outlined in TSB 24-EM-011H.

Repair Procedure Summary

Hyundai Technical Service Bulletin 24-EM-011H details the steps for replacing the Heat Exchange Port at the ITM assembly. The procedure involves several key stages:

1. ITM Module Removal: The Integrated Thermal Management (ITM) Module is carefully removed from the vehicle. This step requires referring to the shop manual for specific instructions under "Engine Mechanical System > Cooling System > Integrated Thermal Management Module (ITM) > Repair Procedures."
2. Heat Exchange Port Replacement: The supplied insulation cap is installed onto the ITM actuator connector. The old heat exchange port is then detached by loosening and removing its fixing screw bolts. Specific components like the Teflon gasket and the heat exchange port itself (including its O-ring) are replaced, while the support and wave spring are reused. The new heat exchange port is then reinstalled and secured with new fixing screw bolts, tightened to 4.4 lb-ft (53 lb-in or 5.9 N.m).
3. ITM Module Reinstallation: The ITM housing gasket is verified for proper fitment, and any excess coolant is wiped away. A new ITM housing gasket is then installed, ensuring it is properly seated in the grooves. The ITM Module is reinstalled into the vehicle, with its bolts tightened to 5.1 lb-ft (61 lb-in or 6.9 N.m). Remaining components are reinstalled in reverse order of removal.
4. Coolant System Refill and Check: The engine coolant is refilled using the previously drained coolant and new coolant as necessary. The engine is started, and a thorough check for any coolant leakage is performed. The coolant level is adjusted to the FULL line, following the ITM Coolant Filling Mode procedure.

Required Tools or Parts

To perform the Integrated Thermal Management (ITM) Module Heat Exchange Port Replacement, the following parts are required:

Part Name	Part Number	Quantity
ITM Service Kit	25690-2J299QQH	1
Heat Exchange Port Assembly	25695-2J299	1
Teflon Gasket	25696-2J299	1
ITM Housing Gasket	25623-2J200	1
Funnel	25697-2J299	1
Coolant Recovery Container	25698-2J299	1
Insulation Cap	25699-2J299	1
Pink Coolant (1 gallon)	00232-19098	As needed

The causal part number for warranty claims is 25600-2J300.

Important Warnings

Owners and technicians should be aware of critical instructions regarding the coolant filling process:

• Coolant Filling Procedure: "Failure to do so may result in air pockets and overheating of the engine." It is crucial to follow the ITM Coolant Filling Mode procedure precisely to avoid air pockets in the cooling system, which can lead to engine overheating.
• Warranty Claims: Claims must be submitted on the Claim Entry Screen as “Campaign” type. Photos of the new and old Heat Exchange Ports, along with the VIN and repair date, are required for submission via STUI. Incident parts may be subject to callback, and claims may be debited if parts are not returned.

Owner Action

If you own a 2024 Hyundai Elantra (CN7) with a 2.0L engine, produced between October 5, 2023, and January 8, 2024 (VINs starting with 'KMH'), and suspect a Hyundai Elantra coolant leak, you should contact your authorized Hyundai dealer. They can diagnose the issue and perform the necessary Integrated Thermal Management (ITM) Module Heat Exchange Port Replacement as outlined in TSB 24-EM-011H.

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Source: NHTSA ID: 11010983