Ford Fiesta Mk7 Focus Mk3 B-Max Thermostat Housing Coolant Flange 2S6G-9K478-BD

Ford Fiesta Mk7 Focus Mk3 B-Max Thermostat Housing Coolant Flange is a component from the Thermostats and housings group, designed for the cooling system in popular Ford models. It is responsible for the stable flow of coolant and the proper connection of the thermostat to the rest of the system, which directly affects the engine's operating temperature and durability. Choosing an original Ford design allows you to maintain factory flow parameters and reliable sealing of connections.

Specifications and technical data

• SKU: 1707050
• Mark: Ford
• Condition: Used
• OEM Part Number: 1707050
• Substitutable numbers: 2S6G-9K478-BD, 2S6G9K478BD, 1707050
• Part type: Thermostat Housing
• Category: Thermostats & Housings

Purpose and function in the cooling system

The thermostat housing with coolant flange used in Ford Fiesta Mk7, Focus Mk3, and B-Max models plays a key role in distributing coolant between the engine and other system components. A properly shaped flange ensures stable medium flow, limits the risk of local overheating, and supports the maintenance of the optimal operating temperature of the power unit. Precise matching of the housing geometry to specific Ford engine series minimizes stress on hoses, reduces the possibility of leaks, and facilitates correct hose positioning during installation. As a result, the cooling system operates predictably, and the diagnosis of potential faults is simpler.

Advantages of using an original Ford housing

Using an original thermostat housing with coolant flange instead of a worn or damaged part brings a number of practical benefits:

• factory flange geometry matched to the cooling system of a given Ford model,
• secure positioning of the thermostat in the housing,
• maintenance of the flow direction and intensity designed by the manufacturer,
• easier installation due to compatibility with original mounts and connection diameters. For the user, this means stable engine operation within the temperature ranges specified by the manufacturer, which helps reduce fuel consumption and lessens the load on other cooling system components. The original Ford design also facilitates subsequent servicing, as all factory reference points for the mechanic are preserved.

Component characteristics and installation

The thermostat housing with coolant flange belongs to a group of components that operate under high-temperature conditions and in contact with coolant, which is why maintaining appropriate material quality and manufacturing precision is essential. In the case of this component, the design was developed by Ford with long-term operation in typical road conditions in mind. During installation, it is crucial to use proper seals and maintain the cleanliness of the contact surfaces to fully utilize the potential of the factory housing. A correctly installed flange reduces the risk of leaks, facilitates system bleeding, and allows for seamless cooperation with other cooling components.

Condition and service application

The offered element comes from the original Ford line and is intended primarily as a service part for cooling system repairs in Fiesta Mk7, Focus Mk3, and B-Max models. It can be used both for typical replacement of a worn housing and for larger jobs, such as cooling system regeneration or thermostat replacement combined with inspection of hoses and the radiator. For workshops and individual users, this means the ability to restore the factory configuration of the cooling system without the need to use replacements with uncertain geometry. Consistency with OEM solutions makes it easier to maintain predictable engine operating parameters and reduces the risk of the fault returning after repair.

Related products and technical knowledge

If you are planning a comprehensive repair or upgrade of the engine area in your Ford and need other elements from the same group, such as additional housings, bodies, or cooling system flanges, check the available parts in the Ford Thermostats and housings category. If you want to better understand why original components, including used ones, are gaining importance in the context of new parts availability and repair cost-effectiveness, it is worth reading our expert material: Crisis in the new parts market? Why used originals for premium cars are the hottest trend in 2026. This will allow you to consciously approach the selection of cooling system elements and optimally plan your vehicle's service.