Ford Mondeo Mk5 Coolant Overflow Radiator Tank Reservoir Bottle DS78-8C045-AE

Ford Mondeo Mk5 Coolant Overflow Radiator Tank Reservoir Bottle is an original cooling system component from the Expansion tanks category, designed for the fifth-generation Ford Mondeo. This used OEM part ensures factory-fit, stable cooling system operation, and predictable engine performance under various operating conditions.

Specifications and technical data

• SKU: DS78-8C045-AE
• Mark: Ford
• Condition: Used
• OEM Part Number: DS78-8C045-AE
• Substitutable numbers: DS78-8C045-AE, DS788C045AE
• Part type: Coolant Overflow Reservoir
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The radiator coolant expansion tank is responsible for compensating for changes in coolant volume, stabilizing pressure, and safely discharging excess fluid. In the Ford Mondeo Mk5, this component works in conjunction with the radiator, hoses, and thermostat to form a cohesive system that maintains the optimal operating temperature of the engine.

Thanks to its factory design, the tank ensures:

• proper coolant circulation throughout the entire system,
• maintenance of the correct fluid level across different temperature ranges,
• the ability to visually check the fluid level (depending on the version),
• stable engine operating conditions during city and highway driving.

Construction and fitment for Ford Mondeo Mk5

The Ford Mondeo Mk5 Coolant Overflow Radiator Tank Reservoir Bottle has been designed as an OEM component, which means it maintains the original geometry, mounting points, and connection ports. This facilitates installation in the engine bay without the need for modifications and ensures compatibility with factory hoses and accessories.

Key design features of this type of tank include:

• a housing adapted to the Ford Mondeo Mk5 cooling system,
• connections matched to standard coolant hoses,
• mounting points aligned with the factory subframe and body elements.

Condition, verification, and service application

The offered item comes from the Expansion tanks category and is a used part, which in practice provides an attractive service solution while maintaining the manufacturer's original specifications. This type of tank is particularly useful for:

• replacing a damaged or leaking tank in the cooling system,
• repairs after engine overheating, where there is a risk of deformation of the old component,
• comprehensive cooling system maintenance after a collision or bodywork intervention.

Using an original expansion tank reduces the risk of fitment issues, leaks, or improper system operation resulting from differences in the design of aftermarket replacements.

Benefits of installing an original expansion tank

Choosing this component for the Ford Mondeo Mk5 allows you to maintain the consistency of the cooling system with the manufacturer's original design. The most important advantages include:

• factory fitment – compatibility with original mounts and hoses,
• stable cooling system performance in daily use,
• reduced risk of engine overheating resulting from improper tank operation,
• suitability for use within standard Ford service procedures.

Cooling system expansion and related components

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

For users interested in comparing technical solutions across different brands and segments, including advanced cooling, brake, and chassis systems in high-performance cars, an article describing the differences between sports versions and standard models may be helpful – you can find it here: Audi RS vs other models – what is hidden under the hood and chassis?.