Thermostat Housing Mercedes W204 W213 C238 C257 W222 Diesel OM656 A6562002200

The Mercedes W204 W213 C238 C257 Diesel OM656 Thermostat Housing is an original cooling system component from the Water Pumps group, designed for OM656 diesel engines. The precise design of the housing ensures stable coolant flow and proper cooperation with the thermostat in modern diesel units. This solution helps maintain optimal engine operating temperature, contributing to its durability and predictable performance in daily use.

Specifications and technical data

• SKU: A6562002100
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6562002200
• Substitutable numbers: A6562002100, A 656 200 21 00, A6562002200, A 656 200 22 00
• Fuel type: Diesel
• Category: Water Pumps

Purpose and Role in the Cooling System

The thermostat housing in the Diesel OM656 engine is responsible for the secure seating of the thermostat and the proper direction of coolant flow between the engine block, radiator, and other system components. In Mercedes vehicles of the W204, W213, C238, and C257 classes, a correctly functioning housing is crucial for:

• maintaining stable engine operating temperature,
• reducing the risk of engine overheating or undercooling,
• ensuring proper cooperation with the water pump and cooling channels,
• maintaining system integrity under varying thermal loads.

Construction and Fit for OM656 Diesel Engine

The thermostat housing in this series has been specifically designed for the OM656 diesel engine architecture, used in modern Mercedes C-Class, E-Class, and CLS models. The geometry of the outlets, mounting points, and internal flow channels are adapted to the factory cooling system, facilitating installation and reducing the risk of leaks after replacement.

By adhering to the original manufacturer's specifications, the component works with the factory water pump and other cooling system components, which is particularly important in high-efficiency and high-thermal-load diesel engines.

Benefits of Using an Original Thermostat Housing

Using a thermostat housing that complies with factory specifications in Mercedes W204, W213, C238, and C257 vehicles offers a number of practical benefits:

• Stable Engine Operating Temperature – proper opening and closing of the circuit by the thermostat due to correct coolant flow.
• Better Engine Protection – reduced risk of localized overheating, which in diesel engines can lead to cylinder head or gasket damage.
• Cooling System Compatibility – fits the factory configuration of channels and water pump without requiring modifications.
• Maintains factory cooling system operating parameters, promoting predictable performance and easier diagnostics.

Component Condition and Service Application

The thermostat housing offered here is a used part, making it an attractive service solution while maintaining original mounting specifications. This type of component is particularly useful for:

• cooling system repairs after coolant leaks,
• replacing damaged or deformed housings after overheating,
• preventive maintenance on high-mileage OM656 diesel engines.

For workshops specializing in the Mercedes brand and for individual users, this means the possibility of restoring correct cooling system operation without altering the engine's construction.

Integration with Fuel System and Diesel Engine Operation

In diesel engines, stable operating temperature has a direct impact on the injection system's performance and the overall smoothness of the unit's operation. A correctly functioning thermostat housing supports:

• maintaining appropriate thermal conditions for precise injector operation,
• efficient heat dissipation under heavy loads,
• effective cooperation with the exhaust gas recirculation system and other diesel engine systems.

To better understand the relationship between engine operating temperature and fuel system function, it is worth reading the article describing the diagnostics and operation of injection systems: Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair.

Related Items from the Mercedes Water Pumps Category

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 pump bodies, connection housings, or cooling system related parts, check the available parts in the Mercedes Water Pumps category.