BMW Expansion Tank Return Hose – OEM Cooling System Replacement, Connects Coolant Reservoir to Water Pipe for E46 320i, 323i, 325i, 328i & 330i Models | Replaces Part No. 11531436410

Restore proper coolant circulation and cooling system reliability with this OEM-style Expansion Tank Return Hose replacement for BMW E46 models. Designed to connect the coolant expansion tank to the cooling system water pipe, this hose plays an important role in maintaining coolant flow, regulating system pressure, and supporting proper engine temperature management.

Over time, coolant hoses are exposed to constant heat cycles, pressure fluctuations, and long-term coolant contact, which can cause the rubber material to harden, swell, crack, or deteriorate. Once the return hose begins to fail, coolant leaks, pressure loss, overheating concerns, and reduced cooling system performance can follow. Replacing worn hoses before they fail is an important preventative maintenance step that helps protect the engine and cooling system from more costly repairs.

Manufactured from durable automotive-grade materials, this replacement coolant hose is built to withstand demanding engine bay temperatures while maintaining flexibility and long-term reliability. The precision-molded construction helps ensure OEM-style fitment and secure connections for dependable, leak-resistant performance.

Whether you are repairing a coolant leak, replacing an aging hose, or refreshing the cooling system as a whole, this direct-fit replacement helps restore factory cooling performance and long-term reliability without requiring modifications.

Key Features:

• Direct OEM Replacement: Designed to replace the factory expansion tank return hose on compatible BMW E46 applications.
• Connects Expansion Tank to Coolant Water Pipe: Maintains proper coolant routing through a critical part of the cooling system.
• Restores Proper Coolant Circulation and System Pressure: Helps support stable cooling system function and dependable temperature control.
• Helps Prevent Coolant Leaks and Overheating: Replacing a worn hose can help reduce the risk of coolant loss and temperature-related engine issues.
• Maintains Cooling System Efficiency and Reliability: Supports long-term cooling system performance under normal and demanding driving conditions.
• Precision-Molded OEM-Style Fitment: Designed to match the original routing and installation layout for secure, leak-resistant connections.
• Durable Heat-Resistant Rubber Construction: Built for long service life in demanding engine bay conditions.
• Ideal for Repairs and Preventative Maintenance: A smart replacement when refreshing aging E46 cooling system components.

FITMENT:

• BMW 3 Series – E46 Sedan, Coupe, Touring, Convertible

Compatible with:
320i Sedan (2001–2005)
323Ci Coupe / Convertible (2000)
323i Sedan / Touring (1999–2000)
325Ci Coupe / Convertible (2001–2006)
325i Sedan / Touring (2001–2005)
325xi Sedan / Touring (2001–2005)
328Ci Coupe (2000)
328i Sedan (1999–2000)
330Ci Coupe / Convertible (2001–2006)
330i Sedan / Touring (2001–2005)
330xi Sedan / Touring (2001–2005)

Engine compatibility:
M52TU inline-6
M54 inline-6
M56 inline-6

If you’re unsure whether this expansion tank return hose fits your specific vehicle, please contact us with your VIN and we’ll be happy to verify compatibility before you order.

Replaces Part No. 11531436410
BMW Reference: 11-53-1-436-410

Please refer to the “Fitment” section in the product description for compatibility details.