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HY 25329-3X600 is a radiator coolant filler neck assembly, made from high-temperature-resistant plastic, designed for use in the engine cooling system. It is mounted on the upper section of the cooling circuit and serves as the coolant filling and connection point between the radiator hose, radiator, and overflow/expansion tank.
This part is commonly used on Hyundai and Kia petrol engines operating in hot-climate (GCC) conditions.

⚙️ Function

• Coolant Filling Point – Allows safe and easy filling of engine coolant into the radiator system

• Coolant Flow Routing – Directs coolant between the radiator, engine, and reservoir

• Pressure Stability – Works with the radiator cap to maintain correct cooling system pressure

• Leak Prevention – Provides sealed hose connections to avoid coolant loss

• Heat Management – Supports efficient engine temperature control, especially in high ambient temperatures