Ford Mondeo Mk4 Coolant Expansion Tank Reservoir 2.2 TDCi 6G91-8K218-FA

Ford Mondeo Mk4 Coolant Expansion Tank Reservoir 2.2 TDCi is an original cooling system component from the Expansion Tanks group, designed for use in 2.2 TDCi diesel engines. It ensures stable operation of the cooling system, enabling proper compensation of fluid volume and maintaining safe thermal parameters of the engine.

Specifications and technical data

• SKU: 6G91-8K218-FA
• Mark: Ford
• Condition: Used
• OEM Part Number: 6G91-8K218-FA
• Substitutable numbers: 1460978, 6G91-8K218-FA, 6G918K218FA
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank is a working component of the cooling system in the Ford Mondeo Mk4 with a 2.2 TDCi engine. It is responsible for:

• compensating for changes in coolant volume during engine heating and cooling,
• maintaining a stable fluid level throughout the circuit,
• providing space for pressure relief from the system,
• enabling visual inspection of the fluid level during operation.

Thanks to its proper design, the tank works in harmony with other cooling system components, reducing the risk of engine overheating and airlocks.

Benefits of using an original Ford tank

Using an original expansion tank in the Mondeo Mk4 2.2 TDCi allows for maintaining the factory cooling system performance parameters. The component is designed for:

• proper fitment to mounts and hoses in the engine bay,
• compatibility with the original pressure cap and sensors (if present in the specific configuration),
• resistance to typical thermal and pressure loads occurring in a diesel engine.

Selecting a tank from the same design group as the factory component reduces the risk of leaks, incorrect hose routing, and issues with system bleeding.

Condition of the component and installation aspects

The offered expansion tank is a used part, which in practice means it comes from vehicle dismantling and may show signs of wear typical for this type of component. Before installation, it is recommended to:

• check the tightness of the body and connection ports,
• verify the condition of the cap seat and any connections,
• thoroughly flush the inside of the tank to remove residues of old fluid.

A properly installed expansion tank restores the correct coolant circulation and allows for further, safe operation of the 2.2 TDCi unit.

Selection by part numbers and system integration

The component should be selected based on the manufacturer's markings and the configuration of the specific Mondeo Mk4 unit to ensure full compatibility with the cooling system. Proper selection translates into:

• trouble-free connection of coolant hoses,
• maintaining the correct geometry of hose routing,
• stable mounting in factory body points.

In case of doubts regarding compatibility, it is worth comparing the shape, placement of ports, and mounting method with the currently installed component.

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

Technical support and additional knowledge

When performing service work on engine systems and accessories, it is worth using reliable sources of knowledge regarding diagnostics and part selection based on manufacturer markings. Extended information on the operation of fuel systems, diagnostic methods, and principles of component selection can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which organizes key service issues and helps in planning further work on the vehicle.