Ford Fiesta MK7 Focus B-Max Thermostat Housing Petrol 7M5G-8K556-AC

Ford Fiesta MK7 Focus B-Max Thermostat Housing is a cooling system component designed for petrol engines, used in popular Ford models in the city and compact segments. It is responsible for the stable flow of coolant in the thermostat area, which has a direct impact on maintaining the correct operating temperature of the power unit and the operational safety of the engine.

Specifications and technical data

• SKU: 1531004
• Mark: Ford
• Condition: Used
• OEM Part Number: 1531004
• Substitutable numbers: 7M5G-8K556-AC, 7M5G8K556AC, 1531004
• Fuel type: Petrol
• Part type: Thermostat Housing
• Category: Thermostats & Housings

Purpose and function in the cooling system

The thermostat housing in Ford Fiesta MK7, Focus, and B-Max models plays a key role in controlling coolant flow. It ensures a tight fit for the thermostat, directs the coolant between the engine block and the radiator, and stabilizes the operation of the entire system within operating temperature ranges. As a result, the engine reaches its operating temperature faster and maintains it within a safe range, which reduces the risk of overheating and unnecessary thermal stress.

Compatibility with petrol engines

The presented housing has been designed to work with petrol units, meaning it is matched to the thermal characteristics of this type of engine. The component's design accounts for typical operating conditions in city and highway driving, including frequent load changes and fluctuations in coolant temperature. Using a dedicated housing for a specific fuel type promotes thermostat stability and improves the predictability of the cooling system's response.

Component characteristics and advantages

The thermostat housing from this series belongs to the Thermostats and housings group, meaning it was developed specifically for operation in the immediate vicinity of components regulating coolant flow. In practice, this translates into:

• properly shaped flow channels that promote uniform coolant circulation,
• stable thermostat mounting, reducing the risk of leaks at a critical point in the system,
• geometry adapted to the engine compartment of Ford Fiesta MK7, Focus, and B-Max models, facilitating installation and service. As a component from the Ford range, the housing retains factory connection geometry and mounting points, which promotes proper fitment with other cooling system components and minimizes the risk of installation issues.

Condition and installation aspects

The product is offered as a used part, which allows for an economical replacement of a damaged or leaking housing while maintaining the original design specifications. Replacing the thermostat housing is particularly recommended if coolant leaks are detected in the thermostat area, if there is mechanical damage to the body, or if there are problems maintaining a stable engine operating temperature resulting from housing leaks. Before installation, it is worth checking the condition of the mating surfaces, connection ports, and the thermostat seat. A properly selected and correctly installed housing reduces the risk of air locks in the system, facilitates bleeding after coolant replacement, and promotes long-term, consistent cooling system performance.

Technical support and additional information

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 thermostat bodies, covers, or additional housing modules, check the available parts in the Ford Thermostats and housings category. For a better understanding of the impact of a functional thermostat housing and the entire cooling system on engine longevity, it is worth reading the guide on diagnosing engine overheating and maintaining cooling components: Engine cooling system – overheating, repair, and used radiators.