Thermostat Housing Mercedes W169 W245 M266 Petrol Coolant A2662030675

Thermostat Housing Mercedes W169 W245 M266 Petrol Coolant is a precision cooling system component, designed specifically for the M266 series petrol engines. Thanks to its factory-fit design for the powertrain, it ensures stable engine thermal operating conditions and proper interaction with the thermostat, which translates into smooth operation and component durability.

Specifications and technical data

• SKU: A2662030675
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2662030675
• Substitutable numbers: A2662030675, A 266 203 06 75, A2662030475, A 266 203 04 75, A2662030275, A 266 203 02 75, KZ
• Fuel type: Petrol
• Category: Thermostats & Housings

Function and role of the thermostat housing

The thermostat housing in the M266 petrol engine is responsible for precise coolant flow management between the engine block and the remaining cooling system components. The correct channel geometry and fitment to the thermostat seat allow for:

• maintaining the optimal operating temperature of the powertrain,
• stable opening and closing of the thermostat,
• reducing the risk of local overheating or engine undercooling,
• proper fluid circulation during warm-up and full-load operation.

For petrol engines used in this generation of Mercedes A-Class and B-Class, a properly functioning thermostat housing has a direct impact on the efficiency of the cooling system as well as the service life of gaskets, the cylinder head, and other auxiliary components.

Compatibility with the M266 engine and petrol fuel

The presented housing has been designed with the specifics of M266 petrol units in mind. This means appropriately selected:

• cooling channel cross-sections adapted to the thermal characteristics of the petrol engine,
• mounting points consistent with the factory auxiliary system layout,
• geometry compatible with the stock thermostat used in this engine family.

As a result, installation in Mercedes W169 and W245 models is predictable, and after replacement, you can restore factory cooling system performance parameters without the need to modify other components.

Benefits of using the original housing

Choosing a thermostat housing dedicated to a specific engine series helps reduce common cooling system issues. The most important advantages include:

• maintaining proper coolant circulation across the entire operating temperature range,
• reducing the risk of leaks at connections with the block and hoses,
• better interaction with temperature sensors and engine management,
• easier diagnostics of potential cooling system faults.

With correct installation and the use of appropriate coolant, the housing helps maintain a stable operating temperature, which is significant for both performance, fuel consumption, and exhaust emissions.

Application in service practice

The thermostat housing in Mercedes W169 and W245 models is a particularly important component when:

• fixing coolant leaks in the thermostat area,
• performing repairs after engine overheating,
• proactively replacing the thermostat in M266 engines,
• restoring the factory cooling system configuration after previous modifications.

Due to the nature of its operation at high temperatures and in contact with coolant, selecting the right housing is crucial for the long-term reliability of the entire cooling system.

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 thermostat bodies, covers, or additional housings, check out the available parts in the Mercedes Thermostats and Housings category.

To better understand the impact of a functional thermostat housing and the entire cooling system on powertrain durability, it is worth reading the guide Engine cooling system – overheating, repair, and used radiators, which discusses the practical aspects of diagnostics and service for this system.