BMW G30 LCI Coolant Hose Cylinder Head Expansion Tank Line Tube Pipe 9844478

BMW G30 LCI Coolant Hose Cylinder Head Expansion Tank Line Tube Pipe is an original component from the Cooling system hoses and pipes group, designed for the cooling system of modern BMW 5 Series LCI models. Engineered as an OEM part, it ensures proper coolant routing between the cylinder head and the expansion tank, which translates into stable engine operating temperatures and safe heat dissipation.

Specifications and technical data

• SKU: 9844478
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9844478
• Substitutable numbers: 17129844478, 9844478
• Category: Coolant Hoses

Purpose and function in the cooling system

The BMW G30 LCI Coolant Hose Cylinder Head Expansion Tank Line Tube Pipe is responsible for the controlled flow of coolant between key system components. A properly selected and leak-free hose:

• stabilizes fluid circulation in the cylinder head area,
• facilitates cooling system bleeding,
• reduces the risk of localized overheating and temperature fluctuations,
• supports even heat distribution throughout the entire circuit.

By maintaining factory geometry and connection diameters, this component works with other cooling system parts without the need for modifications, which promotes hassle-free installation and maintains connection integrity.

Construction and fitment for BMW G30 LCI

The hose has been designed specifically for the engine bay architecture of the BMW G30 LCI, taking into account routing along factory brackets and covers. The properly selected flexibility and shape of the hose:

• ensure proper positioning relative to the radiator, cylinder head, and expansion tank,
• minimize stress at connection points,
• reduce the risk of rubbing against other engine components.

Original connectors and hose ends are prepared for compatibility with factory fittings, which helps maintain the integrity of the entire BMW cooling system and facilitates future service.

Benefits of using an original BMW hose

Choosing a coolant hose from the BMW range is a solution that technically aligns with the vehicle manufacturer's specifications. Using an original part from this group allows you to:

• maintain cooling system performance at the levels intended by the manufacturer,
• preserve compatibility with factory clamps, brackets, and covers,
• reduce the risk of leaks resulting from mismatched diameters or shapes,
• simplify diagnostics and future repairs thanks to clear assignment to the BMW G30 LCI platform.

This is particularly important in modern units where stable engine operating temperature has a direct impact on component durability, fuel consumption, and exhaust emissions.

Condition, verification, and service application

The item comes from disassembly and is intended for reinstallation in a vehicle where restoring the factory routing of cooling system hoses is required. This type of part is suitable both for standard replacement of a worn hose and for post-collision repairs, where it is necessary to restore the original coolant routing system.

In workshop practice, using an original hose from this group allows for reduced installation time, limits the number of potential leak points, and maintains the vehicle's service transparency, which is beneficial for further operation and potential resale of the car.

Cooling system expansion and additional materials

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other components from the same group, such as additional hoses, return lines, or expansion tank outlets, check out the available parts in the BMW cooling system hoses and pipes category.

To better understand how operating conditions affect the durability of hoses and other cooling system components, it is worth checking out our guide: Summer heat vs. cooling system: used radiators and fans as a guarantee of savings. Additional tips on the operation and maintenance of components from disassembly are also provided in the article How to extend the life of used car parts?, which will help optimize the service and use of your BMW.