BMW 3 5 7 X3 X5 Series E32 E39 E46 E65 E53 E83 F10 Expansion Radiator Tank Cap

The BMW E60 E61 E63 E90 Radiator Cap is an original cooling system component from the BMW group, designed for use in selected models of the 5, 6, and 3 series. This product, categorized under Caps & Covers, ensures a sealed closure for the radiator filler neck, stabilizing system operation and supporting safe engine thermal conditions.

Specifications and technical data

• SKU: 7639022
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 1742231
• Substitutable numbers: 17117639022, 7639022, 17111742231, 1742231, 17110152374, 0152374, 17111712492, 1712492, 17111712669, 1712669
• Category: Caps

Purpose and Function of the BMW Radiator Cap

The BMW E60 E61 E63 E90 Radiator Cap is responsible for maintaining the correct pressure in the cooling system and controlling the coolant circulation. A properly selected cap reduces the risk of engine overheating, leaks, and air ingress into the system, which translates to stable engine operation across a wide range of loads.

As an original BMW part, the cap is structurally matched to the factory radiators used in the mentioned models, facilitating installation and minimizing the risk of leaks due to imprecise fitting.

Construction, Fitment, and Interchange Numbers

The cap belongs to the category of cap-type elements, mounted directly onto the radiator neck or expansion tank (depending on the specific vehicle configuration). The use of appropriate threading and sealing ensures proper seating and resistance to temperature and pressure changes within the system.

This model has an assigned OEM part number and a set of interchangeable numbers, allowing for precise identification in BMW catalogs and professional parts selection systems. This makes it easier to verify the cap's compatibility with a specific engine version and model year of the vehicle, as well as to replace earlier versions of this component with a newer equivalent.

Product Condition and Benefits of Choosing a Used Part

The offered radiator cap is in used condition, representing a reasonable compromise between cost and functionality. In practice, this means the possibility of restoring full cooling system efficiency with a lower financial outlay than purchasing a brand-new component.

Choosing a used BMW radiator cap is a good solution, for example, when:

• the existing cap has suffered mechanical damage (crack, worn thread, damaged seal),
• there are problems with maintaining pressure in the cooling system,
• a quick, economical replacement of a wear-and-tear part is necessary.

Why Choose Original BMW Caps & Covers

Elements from the Caps & Covers category made by BMW are designed for specific models and engine variants, which translates to:

• secure fitment to the factory radiator neck or tank,
• maintenance of pressure parameters specified by the vehicle manufacturer,
• compatibility with other cooling system components.

Thanks to this, the BMW E60 E61 E63 E90 radiator cap can be used as a direct replacement for the factory part, without the need for modifications or additional adapters.

Selecting Other BMW Caps & Covers and Knowledge about Used Parts

If you are looking for other BMW Caps & Covers compatible with your model, check out the BMW Caps & Covers available in our assortment to complete other body or accessory parts according to factory specifications.

When choosing parts from the secondary market – whether for the cooling system or the drivetrain – it is worth knowing the basic principles of technical condition assessment. Practical tips for purchasing used components, such as differentials, sensors, or drivetrain parts, can be found in the guide Used Differentials – What You Should Know About Used Differentials, Sensors, and Drivetrain Systems, which will help you make more informed purchasing decisions.