BMW 1 3 Series E87 E90 E91 M47N2 Hose Expansion Tank Pipe Line Tube 7789592

Description

BMW 1 3 Series E87 E90 E91 M47N2 Hose Expansion Tank Pipe Line Tube is an original cooling system component from the Lines, hoses and pipes group, designed for use in BMW vehicles with the M47N2 engine. It is a practical solution for users who want to restore proper coolant circulation and maintain stable operating conditions for the power unit.

Specifications and technical data

• SKU: 7789592
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7789592
• Substitutable numbers: 17127789592, 7789592, AS
• Category: Hoses, Lines & Pipes

Purpose and function of the expansion tank hose

The presented hose is responsible for the controlled flow of coolant between the expansion tank and other cooling system components in BMW 1 Series E87 and 3 Series E90/E91 models with the M47N2 engine. A properly selected hose ensures a tight connection, which reduces the risk of air entering the system, drops in fluid levels, and engine overheating.

By maintaining factory geometry and connection diameters, the hose allows for stable cooling system operation, maintenance of proper pressure, and correct discharge of excess fluid into the expansion tank. This is particularly important in diesel engines, where thermal loads are significantly higher.

Construction and fitment for BMW E87 / E90 / E91

The element was designed as an original BMW part, which translates into a proper fit for factory connectors and mounting brackets in the engine bay. The correctly shaped hose routing minimizes stress, friction against adjacent components, and the risk of abrasion during operation.

The hose is ready for installation in place of the factory element, without the need for modifications or the use of additional adapters. Such a solution facilitates the mechanic’s work, shortens service time, and reduces the risk of leaks resulting from the incorrect selection of a replacement part.

Benefits of using an original BMW hose

Using an original expansion tank hose in the cooling system of a BMW E87, E90, and E91 with an M47N2 engine allows for maintaining the operating parameters specified by the vehicle manufacturer. In practice, this means:

• stable engine operating temperature under various load conditions,
• reduced risk of coolant leaks at connections,
• proper cooling system venting,
• easier diagnostics of potential faults related to overheating.

A used, original element can be a reasonable alternative to cheap replacements, especially for vehicles used intensively, where predictable material behavior and proper fitment to the rest of the system are important.

Product condition and service aspects

The offered hose comes from dismantling and is classified as used, which allows for an economical repair of the cooling system while maintaining the original manufacturer’s specifications. Before installation, a standard visual inspection for any signs of excessive wear is recommended, as well as replacing the clamps if their condition is questionable.

A good solution is to combine the hose replacement with an inspection of other cooling system elements – the expansion tank, radiator, and return lines. Such a service approach reduces the risk of further vehicle downtime and allows the system to be kept in a consistent technical condition.

System expansion – other BMW lines, hoses and pipes

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 return lines, main hoses, or vent pipes, check the available parts in the BMW lines, hoses and pipes category.

Expert support when choosing used components

When selecting used cooling system elements, it is worth being guided not only by price but also by the origin of the part, compliance with manufacturer markings, and service history. It can be helpful to use OEM numbers and interchangeable numbers, which facilitate precise identification of the component for a specific engine and body variant.

If you want to better understand the specifics of the used parts market, the differences between individual component groups, and the principles of selection based on manufacturer markings, it is worth reading the expert guide: Why it is worth buying used gearboxes and engines – facts instead of myths. Although it mainly concerns power units and transmissions, the procedures and approach to verifying parts presented there can be successfully applied to other elements as well, such as cooling system hoses.