BMW 5 Series E60 E61 LCI Radiator Engine Cooling Coolant Water Hose 7799748

BMW 5 Series E60 E61 LCI Radiator Engine Cooling Coolant Water Hose is an original cooling system component designed for facelifted BMW 5 Series models. As part of the Cooling system hoses and pipes group, it ensures the proper flow of coolant between the radiator and other engine components, supporting stable operating temperatures for the powertrain. This used OEM part is a sensible choice for drivers looking for a technically compatible solution at an attractive price.

Specifications and technical data

• SKU: 7799748
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 17127799748
• Substitutable numbers: 17127799748, 7799748
• Category: Coolant Hoses

Purpose and function in the cooling system

The presented water hose is part of the system responsible for transporting coolant between the radiator and the engine in BMW E60 and E61 LCI versions. A properly selected hose:

• maintains the tightness of the coolant circuit under varying pressure and temperature,
• ensures a stable flow of the cooling medium,
• reduces the risk of engine overheating,
• supports even heat dissipation from the engine block.

Thanks to its factory fitment for this specific generation of the BMW 5 Series, the hose maintains the correct routing geometry, which minimizes stress, twisting, and potential leaks in the system.

Original BMW fitment and mounting parameters

As a BMW brand product, the hose has been designed for full compatibility with the factory cooling system in E60/E61 LCI models. This means:

• compatibility with original radiator ports, connectors, and engine components,
• the correct length and shape adapted to the engine bay,
• easier installation without the need for modifications or adapters.

The original hose from the Cooling system hoses and pipes group allows for maintaining the factory operating characteristics of the system, which is particularly important in vehicles equipped with advanced engine temperature control electronics.

Used condition – a conscious service choice

The item is offered in used condition, which is a beneficial solution for users looking for an economical yet technically compatible part. In practice, this means:

• the ability to reduce cooling system repair costs while maintaining original specifications,
• better fitment than many low-budget aftermarket replacements,
• a chance to quickly restore the efficiency of the cooling circuit after a hose failure.

Before installation, a standard check of tightness and the condition of the connection surfaces is recommended, as well as replacing hose clamps if required by the vehicle manufacturer.

The importance of a functional radiator hose for the engine

A functional radiator water hose in a BMW E60/E61 LCI has a direct impact on the thermal safety of the powertrain. Leaks, pressure drops, or restricted flow can lead to overheating and, consequently, costly engine damage. Replacing a worn hose with an original OEM part:

• stabilizes the cooling system operation across a wide range of loads,
• reduces the risk of sudden coolant loss,
• supports maintaining the optimal operating temperature, which translates into engine durability.

For a full understanding of the role of such components in protecting the powertrain, it is worth checking out our guide on cooling system diagnostics and maintenance: Engine cooling system – overheating, repair, and used radiators.

Complementary BMW cooling system components

If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other elements from the same group, such as additional lines, return hoses, or connecting sections to the radiator, check out the available parts in the BMW cooling system hoses and pipes category.

When selecting used cooling system components and other parts, it is worth considering not only the price but also the origin and compliance with the vehicle's factory specifications. Practical tips on making conscious choices when buying aftermarket parts can be found in the article: Used parts – your guide to the best deals in an automotive store.