Expansion Tank BMW U06 X1 U11 X2 U10 Coolant Reservoir Bottle 5A14990

Expansion Tank BMW U06 X1 U11 X2 U10 Coolant Reservoir Bottle is an original cooling system component designed for precise integration with the factory installation in these models. Thanks to its design, which meets BMW standards, it ensures stable engine operating conditions, proper coolant circulation, and safe pressure relief. It is a practical solution for users looking for a proven, factory-spec component rather than aftermarket replacements of unknown origin.

Specifications and technical data

• SKU: 5A14990
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 5A14990
• Substitutable numbers: 5A14990, 17135A14990
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank is part of the Expansion Tanks category, responsible for compensating for coolant volume changes during engine heating and cooling. A properly selected tank:

• stabilizes pressure in the cooling system,
• enables safe venting of the system,
• ensures clear coolant level monitoring,
• reduces the risk of engine overheating.

Thanks to its factory fitment for specific BMW models, installation is straightforward, with no need for modifications to mounts or hoses.

Original origin and BMW fitment

As a BMW brand product, the expansion tank has been designed to maintain the factory performance parameters of the cooling system. This means:

• compliance with the original engine bay geometry,
• correct positioning of connection ports relative to cooling hoses,
• compatibility with factory sensors and equipment (if present in the vehicle's specific configuration),
• material consistency with other system components.

Such fitment reduces the risk of leaks and operational issues resulting from the use of random aftermarket replacements. The original expansion tank is the preferred solution for repairs where predictability and durability are paramount.

Condition of the component and service application

The offered expansion tank is a used part, making it an attractive cost-effective alternative while maintaining factory specifications. It is particularly useful in situations where:

• a quick replacement of a damaged or leaking tank is necessary,
• the priority is to maintain the original cooling system design,
• the vehicle is used intensively and requires proven components.

Selecting the right expansion tank has a direct impact on engine thermal safety, which is why it is worth choosing a part consistent with factory design assumptions when planning a repair.

Benefits of using an original expansion tank

Using this component in the BMW X1 U06, X2 U11, and U10 allows for maintaining the integrity of the entire cooling system. Key advantages include:

• factory fitment with mounts and hoses,
• preservation of the system's operating characteristics as intended by the manufacturer,
• reduced risk of leaks and engine overheating,
• easier diagnostics of potential future faults.

For workshops and individual users, this means more predictable installation and a lower risk of needing to revisit the cooling system.

Expanding the BMW cooling system – related components

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as additional tanks, mounting hardware, or related cooling system components, check out the available parts in the BMW Expansion Tanks category.

For drivers interested in broader vehicle personalization – especially regarding ergonomics and driving feel – practical tips on selecting interior equipment, available in the article Personalization and ergonomics – when is it worth replacing the steering wheel with a premium model?, may also be helpful.