BMW 3 Series E90 E91 E92 E93 LCI Hose Radiator Transmission Oil Cooler

BMW E90 E91 E92 Coolant Hose Pipe Water Pipe is an original cooling system component from the Hoses, Pipes and Tubes group, designed for use in popular 3 Series models. Thanks to its factory geometry and fit for BMW installations, it ensures stable coolant flow and proper cooperation with other system components. A used OEM part is a sensible choice for cooling system service when you want to maintain proper engine operating parameters without excessive costs.

Specifications and technical data

• SKU: 7811126
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7811126
• Substitutable numbers: 17128511721, 8511721, 17127811126, 7811126
• Category: Hoses, Lines & Pipes

Function and Role in the BMW Cooling System

The water cooling hose in BMW E90, E91, and E92 models is responsible for directing coolant between system components such as the engine block, radiator, and other auxiliary components. A correctly selected hose maintains the circuit's seal, stabilizes the engine's operating temperature, and reduces the risk of overheating during intensive use.

Thanks to its factory profile and inner diameter, the hose ensures proper fluid flow, which translates to uniform heat dissipation from the engine. Original geometry minimizes stress on the connectors and joints, which is particularly important in vehicles operated in varied temperature conditions.

Why Choose an Original BMW Hose

Using an OEM hose in the BMW cooling system is crucial for both the durability and stability of engine operation. Compared to aftermarket alternatives, a factory part offers:

• precise fit to the connectors and mounting points in the engine bay,
• appropriately selected material flexibility,
• maintenance of the fluid flow characteristics designed by the manufacturer,
• compatibility with original clamps and connectors.

This combination of features helps maintain a stable operating temperature, which impacts the lifespan of the engine, its accessories, and fuel consumption. Consistency with the factory design reduces the risk of leaks and improper hose routing in the engine bay.

Application in Service and Diagnostics

Replacement of the water cooling hose is recommended when visible signs of wear are present, such as cracks, material softening, deformation, or signs of leaks. A used OEM part is well-suited as a service part in situations where:

• a damaged section of the cooling system needs to be replaced quickly,
• maintaining the original hose routing is a priority,
• compatibility with factory mounting points and covers is important,
• an economical solution is needed while maintaining manufacturer standards.

The used condition allows for a lower repair cost while maintaining the part's characteristics as intended by BMW for this generation of the 3 Series.

Integration with Other BMW System Components

The water cooling hose works in conjunction with other cooling system components, forming a cohesive fluid circuit. A correctly selected part:

• maintains a sealed connection with connectors and manifolds,
• ensures proper positioning relative to the fan, covers, and other hoses,
• reduces the risk of rubbing against bodywork or engine accessories,
• facilitates system bleeding after service.

As a result, the BMW E90 E91 E92 Coolant Hose Pipe Water Pipe is a functional element for comprehensive cooling system maintenance in these models.

Service Expansion and Additional Information

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other parts from the same group, such as additional hoses, pipes, or tubes, check the available parts in the BMW Hoses, Pipes and Tubes category.

When planning service, it is also worth considering the specifics of the engine installed in your car. To better understand the differences between popular BMW diesel engines and their service requirements, refer to the article BMW N47 vs M57 / M57N / M57N2 – Ranking of Legendary Diesels, which discusses performance, reliability, and operating costs in the context of the used car market.