Ford Focus Mk4 Transit Connect Mk2 Expansion Tank Reservoir Cap DG93-8101-AA

Ford Focus Mk4 Transit Connect Mk2 Expansion Tank Reservoir Cap is an original cooling system component from the Expansion tanks group, designed for use in Ford vehicles. It ensures proper sealing of the reservoir, pressure stabilization, and safe operation of the coolant during daily use.

Specifications and technical data

• SKU: DG93-8101-AA
• Mark: Ford
• Condition: Used
• OEM Part Number: DG93-8101-AA
• Substitutable numbers: DG93-8101-AA, DG938101AA
• Part type: Coolant Expansion Tank
• Category: Expansion & Overflow Tanks

Purpose and technical function

The expansion tank cap is responsible for maintaining the tightness of the cooling system and controlling the operating pressure within the reservoir. A correctly selected component of this type reduces the risk of engine overheating, coolant leaks, and system aeration, which translates into stable operation of the power unit. In the case of Ford Focus Mk4 and Ford Transit Connect models, the use of a dedicated cap is particularly important due to the specifics of the factory cooling system. The appropriate characteristics of the pressure valve in the cap support the maintenance of proper fluid operating parameters across a wide temperature range.

Why it is worth using an original Ford cap

The original expansion tank cap for Ford has been designed for specific thread geometry, sealing, and safety valve characteristics. Thanks to this:

• it ensures a fit to the factory expansion tank without the need for modifications,
• it maintains the tightness of the cooling system under typical thermal loads,
• it limits the risk of uncontrolled pressure drops or increases in the reservoir,
• it supports uniform operation of the cooling system in both city and highway conditions. Choosing an original element from the Expansion tanks group allows you to maintain the parameters specified by the vehicle manufacturer, which is important for both engine durability and vehicle comfort.

Performance characteristics and installation

The presented cap is a component intended for installation in place of the factory expansion tank cap. The design based on the OEM solution enables plug-and-play installation, without the need for additional adapters or reservoir modifications. The product is offered in used condition, which means it comes from disassembly and is intended for users looking for an economical yet structurally compliant solution. This type of part can be an attractive alternative to new replacements with uncertain pressure parameters.

Application in the Ford cooling system

In Ford Focus Mk4 and Ford Transit Connect vehicles, the expansion tank cap plays an important role in protecting the cooling system against thermal overloads. A properly functioning cap:

• stabilizes pressure in the reservoir during changes in fluid temperature,
• limits the risk of damage to hoses and plastic components of the cooling system,
• supports the maintenance of the proper fluid level in the expansion tank. By maintaining factory design assumptions, the use of an original cap helps to maintain predictable cooling system behavior over a long period of operation. If you are planning a comprehensive repair or upgrade of the cooling system area in your Ford and need other components from the same group, such as reservoir housings, connection ports, or complete reservoir modules, check the available parts in the Ford Expansion tanks category. For users interested in the broader context of using original components from disassembly in servicing premium vehicles, valuable information on the cost-effectiveness and safety of such solutions can be found in the article on servicing Porsche cars using original used parts.