BMW 3 5 7 X3 Series E39 E46 E60 E61 E65 E83 Expansion Radiator Tank Cap 1742232

BMW 3 5 7 X3 Series E39 E46 E60 E61 E65 E83 Expansion Radiator Tank Cap is an original cooling system component designed for selected BMW models, ensuring proper operating pressure and safe engine performance. As part of the Covers group, the cap acts as a precision seal for the expansion tank or radiator, reducing the risk of leaks and overheating. Using an OEM component is a sensible choice for drivers looking for a factory fit without the need for an expensive purchase of a new part.

Specifications and technical data

• SKU: 7639023
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7639023
• Substitutable numbers: 17137639023, 7639023, 17111742232, 17111719167, 17114379048, 17112242256, 1742232, 1719167, 4379048, 2242256, AS
• Category: Caps

Purpose and technical function

The radiator cap in BMW E39, E46, E60, E61, E65, and E83 series models is responsible for sealing the cooling system and maintaining the appropriate fluid pressure. A correctly selected component helps stabilize the engine's operating temperature, which translates into the longevity of the engine and other components working with the cooling system.

The original design ensures:

• precise fit to the thread and socket of the radiator or expansion tank,
• correct pressure valve characteristics,
• compatibility with factory cooling system hoses and connectors.

Advantages of using an original BMW cap

Choosing an original BMW radiator cap allows you to maintain the operating parameters specified by the vehicle manufacturer. The OEM component is designed for the specific geometry of the radiator and tank, thereby minimizing the risk of leaks and improper system venting. This is particularly important in modern units, where overheating can quickly lead to costly repairs.

Key benefits include, among others:

• factory fit – no need for modifications or adjustments,
• stable maintenance of operating pressure in the cooling system,
• preservation of the engine's thermal characteristics as intended by the manufacturer.

Product characteristics and condition

The presented radiator cap is a BMW part sourced from dismantling, in used condition. This type of component, provided the valve mechanism and seals are functional, can be an effective alternative to a new part, especially in vehicles used daily. A used OEM cap allows you to maintain the integrity of the cooling system with other factory components.

Thanks to the original design, the cap works with factory temperature and pressure sensors and does not introduce changes to the cooling system's operating characteristics, which is important from a diagnostic and service perspective.

Selection and compatibility with replacement numbers

The element has an assigned OEM part number and a set of interchangeable numbers, which facilitates clear identification in BMW catalogs and service systems. This allows for precise verification of the cap's compatibility with a specific engine version and model year, reducing the risk of purchasing an incompatible part.

Before installation, it is recommended to compare the part with the one currently installed in the vehicle and verify compatibility in the manufacturer's catalog or with a specialist, which will allow you to fully utilize the advantages of the original component.

Why choose a used OEM part

In the case of elements such as a radiator cap, a used OEM part often provides a better fit than many aftermarket replacements, while maintaining a favorable cost-to-functionality ratio. Factory components are designed for long-term cooperation with other system elements, which translates into predictable performance during operation.

If you want to better understand when a used original part is a sensible choice compared to a replacement, it is worth reading the practical tips in the article 5 reasons why a used OEM part is a better choice than a replacement.

Expansion of upgrades within the BMW cooling system

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 covers, caps, or supplementary mounting elements, check the available parts in the BMW Covers category.