BMW 3 E90 E91 E92 335d M57N2 Radiator Bottom Coolant Pump Water Hose Pipe

BMW 3 E90 E91 E92 335d M57N2 Radiator Bottom Coolant Pump Water Hose Pipe is a component from the Cooling system hoses and pipes group, designed for diesel engines in popular 3 Series models. It is responsible for the reliable routing of coolant within the system, which has a direct impact on the stable operating temperature of the power unit and operational safety. This is a practical solution for users looking for a proven component for the cooling system in the 335d version with the M57N2 engine.

Specifications and technical data

• SKU: 7796271
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7796271
• Substitutable numbers: 17127796271, 7796271
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and function in the cooling system

The offered water hose is designed to work with the diesel engine in BMW E90, E91, and E92 series models in the 335d version with the M57N2 unit. Its task is to provide controlled routing of coolant between system components, which helps maintain the optimal engine operating temperature and reduces the risk of overheating. Thanks to its properly selected shape and diameter, the hose ensures a stable flow of the cooling medium, supporting the correct operation of the pump, radiator, and other components.

Benefits of using an original BMW hose

Using a water hose from the BMW range allows you to maintain the factory operating parameters of the cooling system. The original connection geometry facilitates installation in the engine bay, and the precise fit for the specific 335d M57N2 version reduces the risk of leaks and stress on the connectors. For the user, this means:

• more reliable maintenance of the diesel engine's operating temperature,
• reduced risk of coolant leaks,
• easier installation without the need for system modifications,
• consistency with other cooling system components.

Performance characteristics and installation

The water hose for the BMW E90, E91, and E92 335d M57N2 is a component prepared for operation in the demanding thermal conditions typical of diesel engines. The hose construction is adapted to the loads resulting from cyclic temperature and pressure changes in the cooling system. In practice, this translates into stable performance during city driving, highway driving, and under higher engine loads.

The element comes from the Cooling system hoses and pipes group, which means it has been designed to work with factory connectors and clamps. Proper positioning in the engine bay minimizes the risk of rubbing against other components and facilitates potential service activities during subsequent inspections.

Product condition and service application

The offered hose is a used part, which is a cost-effective solution for users looking for an economical alternative while maintaining the manufacturer's original specifications. This type of component is suitable both for standard replacement of a worn hose and for repairing the cooling system after a failure, when it is necessary to restore full coolant circulation.

Thanks to its fitment for the M57N2 diesel engine, the hose can be used in professional services specializing in the BMW brand, as well as in independent workshops that service E90, E91, and E92 models. Maintaining compatibility with the factory cooling system facilitates diagnostics and subsequent leak checks.

Cooling system expansion and technical knowledge

When working on the coolant circulation system, it is worth looking at the entire system as a whole – from hoses and the radiator to the fans. High temperatures, especially in summer, place a heavy load on the cooling system, which is why the selection of appropriate components has a real impact on engine durability. To better understand how thermal conditions affect system operation and where to look for savings while maintaining safety, it is worth reading the guide: Summer heat vs. cooling system – used radiators and fans as a way to control costs.

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other elements from the same group, such as additional pipes, flexible water hoses, or coolant return pipes, check the available parts in the BMW cooling system hoses and pipes category.