Coolant Tank BMW E39 E38 Petrol M52 Expansion Coolant Reservoir Cap 1436381

Coolant Tank BMW E39 E38 Petrol M52 Expansion Coolant Reservoir Cap is an original cooling system component designed for M52 petrol engines. This used expansion tank with a complete cap allows you to restore the proper operation of the cooling system without the need for aftermarket replacements. It is a solution for users who value factory fitment, stable operating parameters, and compatibility with BMW design.

Specifications and technical data

• SKU: 1436381
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 1436381
• Substitutable numbers: 1436381, 17111436381
• Fuel type: Petrol
• Tire profile: 65535
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank is a component of the cooling system in BMW E39 and E38 models with the M52 petrol engine. It is responsible for compensating for coolant volume, stabilizing pressure, and safely discharging excess fluid under varying engine operating temperatures. Thanks to the use of the original BMW design, proper coolant circulation and correct system venting are maintained.

The included cap plays a key role in maintaining the correct operating pressure, which translates into predictable temperature behavior of the power unit. Using the complete set (tank with cap) reduces the risk of leaks resulting from component mismatch.

Benefits of using an original BMW tank

Choosing an original expansion tank for a BMW E39/E38 with an M52 engine provides a number of practical technical benefits:

• preservation of factory geometry and mounting points, which facilitates installation in the engine bay,
• proper fitment of connection ports for cooling system hoses,
• consistency with the operating parameters of the petrol engine system,
• reduction of the risk of overheating resulting from incorrect operating pressure.

For users who operate their BMW intensively or over long distances, using an original expansion tank is an important element of preventing cooling system failures. This is especially important in the case of petrol units, where a stable operating temperature affects the durability of seals and accessory components.

Condition, compatibility, and installation aspects

The offered item comes from the Expansion tanks group and is a used part, which allows for an economical repair while maintaining the original BMW specification. Before installation, a standard cooling system check is recommended, including verification of hoses, clamps, and connection tightness, to fully utilize the potential of this component.

Due to its factory origin, the tank is structurally prepared to work with the M52 petrol engine, which facilitates installation without the need for system modifications. In practice, this translates into shorter service time and a lower risk of operational problems after replacement.

Operational tips and part selection

When replacing the expansion tank, it is worth paying attention to:

• the condition of the coolant and the potential need for its replacement or filtration,
• proper venting of the system after installation,
• checking for leaks after the first engine heating and cooling cycles.

Selecting the right component for a specific version of the BMW E39 or E38 is facilitated by the presence of a dedicated OEM part number and interchangeable numbers in the technical specification. This allows for precise verification of compatibility with your vehicle, which is especially important given equipment and model year differences.

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other items from the same group, such as additional tanks, hoses, or mounting elements, check the available parts in the BMW Expansion tanks category.

For drivers considering a wider range of service work on the power unit, including potential replacement or engine overhaul, a practical guide on verifying used engines may be helpful – detailed tips can be found in the article Buying a used engine: 5 things you must check before installation.