Ford Fiesta Mk5 Water Coolant Expansion Tank Bottle Reservoir 5S6Y-8K218-AB

Ford Fiesta Mk5 Water Coolant Expansion Tank Bottle Reservoir is an original cooling system component, designed specifically for this model. As part of the Expansion tanks group, it ensures stable operation of the engine's thermal system by maintaining the correct coolant level and pressure. This is a practical solution for users looking for a proven OEM component for effective repair or replacement.

Specifications and technical data

• SKU: 5S6Y-8K218-AB
• Mark: Ford
• Condition: Used
• OEM Part Number: 5S6Y-8K218-AB
• Substitutable numbers: 5S6Y-8K218-AB, 5S6Y8K218AB, 1349989
• Part type: Coolant Expansion Tank
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank is a cooling system component responsible for compensating for changes in fluid volume during engine heating and cooling. A properly selected tank helps maintain stable pressure in the circuit, which reduces the risk of engine overheating and leaks at hose connections. Thanks to the design developed by the vehicle manufacturer, the tank works with factory hoses, the cap, and sensors, which facilitates installation and subsequent operation. The appropriate shaping of the connection ports promotes a tight connection with the rest of the cooling system.

Original origin and fitment

As a Ford brand product, the expansion tank complies with factory quality and geometry standards. This means proper fitment to the mounts in the engine bay, compatibility with original brackets, and predictable behavior under typical vehicle operating conditions. The original origin translates into:

• secure fitment with the existing cooling system,
• preservation of the fluid flow path designed by the manufacturer,
• easier diagnostics of potential leaks after installation.

Performance characteristics and installation benefits

Replacing the expansion tank is recommended in situations where micro-cracks, deformations, or traces of previous repairs appear on the housing. Using an original component allows for restoring the proper operation of the cooling system without the need for system modifications. This solution is particularly beneficial for servicing vehicles used on a daily basis, where predictability and durability are important. The main benefits of using this tank include:

• restoration of factory cooling system functionality,
• maintaining compatibility with other OEM components,
• reducing the risk of engine overheating resulting from fluid loss.

Condition and service application

The item comes from dismantling and is offered as a used expansion tank, which is a cost-effective solution for maintenance repairs. This type of part will work well both for the immediate replacement of a damaged tank and for broader service work within the cooling system, including, for example, replacing hoses or coolant. Selecting an original component from this group allows for maintaining the consistency of the technical solutions used in the vehicle, which is important from the point of view of long-term reliability.

Service expansion and additional information

If you are planning a comprehensive repair or upgrade of the engine area in your Ford and need other items from the same group, such as additional tanks, mounting elements, or related cooling system components, check the available parts in the Ford expansion tanks category. When planning work related to the cooling system, it is also worth considering the condition of the cabin heating system and related components. Practical tips on selecting used OEM elements and the service schedule can be found in the article Air conditioning and heating – part selection and maintenance for year-round comfort, which helps to organize the scope of work and select the appropriate components.