Mercedes-Benz C E W202 W203 W210 M111 Coolant Thermostat Housing A1112030473

Mercedes-Benz C E W202 W203 W210 M111 Coolant Thermostat Housing is a component from the Thermostats and housings category, designed for the cooling system of M111 series engines in popular Mercedes-Benz models. It is responsible for the stable seating of the thermostat and proper coolant flow, which translates into a safe operating temperature for the power unit. This solution allows for a professional repair of the cooling system while maintaining the manufacturer's original design concept.

Specifications and technical data

• SKU: A1112001303
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1112001303
• Substitutable numbers: A1112001303, A 111 200 13 03, A1112030473, A 111 203 04 73, A0005426218, A 000 542 62 18, BG
• Category: Thermostats & Housings

Purpose and function in the cooling system

The thermostat housing in the M111 engine plays a key role in precisely directing the flow of coolant between the engine block, cylinder head, and radiator. A properly selected component ensures:

• stable mounting of the thermostat in the operating position intended by the manufacturer,
• a tight connection with the coolant channels,
• maintenance of proper fluid circulation across various temperature ranges.

As a result, the engine reaches operating temperature faster and maintains it within a safe range, which reduces component wear and supports smooth, predictable operation of the power unit.

Application in Mercedes-Benz models

The presented Mercedes-Benz C E W202 W203 W210 M111 Coolant Thermostat Housing has been designed for use in popular Mercedes-Benz C-Class and E-Class generations, such as the W202, W203, and W210. The design is matched to the cooling system architecture of these models, which facilitates installation and allows for maintaining the original routing of hoses and connection ports.

The component comes from the Mercedes brand, which means maintaining factory geometry, the appropriate shape of flow channels, and mounting points. This minimizes the risk of fitment issues, leaks, or incorrect thermostat positioning relative to fluid flow.

Technical characteristics and installation

The thermostat housing belongs to the group of cooling system consumables that may eventually suffer from mechanical wear or damage resulting from operation at high temperatures. Replacing it with the correct component helps restore:

• proper tightness of connections in the thermostat area,
• stable coolant flow within the engine,
• trouble-free cooperation with sensors and other cooling system components.

The housing is prepared for installation in place of the factory component, using the mounting points provided by the manufacturer. With properly selected seals and adherence to service procedures, it is possible to achieve a durable, secure connection without the need for system modifications.

Product condition and benefits of choosing a used component

The offered thermostat housing is a used part, which allows for an economical repair of the cooling system while maintaining the manufacturer's original design. In many cases, a used OEM component provides a better fit than replacements with uncertain geometry, especially in older vehicle generations.

If you are considering whether new or used parts are a better choice in your case, an article describing the differences in costs, quality, and durability may be helpful – check the material: Car parts – new or used? We compare costs, quality, and durability. This will allow you to consciously choose a service strategy for your specific vehicle.

Cooling system expansion in Mercedes-Benz

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional housings, thermostat bodies, or connection elements, check the available parts in the Mercedes Thermostats and housings category.