Mercedes X164 OM629 Thermostat A6292000315

Mercedes X164 OM629 Thermostat is a component from the Thermostats and housings group, designed for the diesel engine cooling system. It is responsible for precise control of the engine's operating temperature, which translates into stable thermal characteristics, proper engine performance, and reduced component wear.

Specifications and technical data

• SKU: A6292000315
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6292000315
• Substitutable numbers: A6292000315, A 629 200 03 15
• Fuel type: Diesel
• Category: Thermostats & Housings

Purpose and function in the cooling system

The thermostat in the OM629 diesel engine fitted in the Mercedes X164 class controls the flow of coolant between the engine block and the radiator. This allows the engine to reach its operating temperature faster and then maintain it within the optimal range, which is important for both durability and performance.

In diesel engines, especially those with large displacement, stable thermal conditions are crucial for limiting mechanical and thermal stress. A functional thermostat reduces the risk of overheating while preventing the engine from running too cold, which could lead to increased fuel consumption and deposits in the intake system.

Technical specifications and compatibility

The offered item belongs to the Thermostats and housings category and is designed for a diesel engine, meaning it is adapted to the specific operating conditions of diesel units – higher thermal loads and longer duty cycles. The thermostat design is integrated with the housing, which facilitates installation and limits the number of potential leak points in the cooling system.

As a part dedicated to Mercedes, the thermostat ensures proper geometric fitment to the cooling system, correct positioning of the connectors, and proper cooperation with other components, such as hoses, the water pump, or the radiator. As a result, installation is straightforward, without the need for any system modifications.

Condition of the item and practical application

The product is offered as a used part, which allows for an economical repair of the cooling system while maintaining the manufacturer's original specifications. For many users of vehicles with the OM629 engine, this is a sensible solution that allows for restoring the proper operation of the cooling system without the need to invest in more expensive replacements.

Replacing the thermostat is particularly recommended in the event of symptoms such as the engine warming up too slowly, fluctuations in operating temperature, overheating under load, or improper cabin heating operation. A functional component contributes to the stable operation of the engine, which is important for both driving comfort and engine longevity.

Benefits of using an original thermostat

Using a thermostat dedicated to the Mercedes X164 with a diesel engine ensures:

• maintaining the proper engine operating temperature under various load conditions,
• reducing the risk of engine overheating,
• stable cooling system operation during high mileage and long-term use,
• better compatibility with the factory engine control system.

As a result, the thermostat is an important element of preventive maintenance, especially in vehicles used for towing, in mountainous terrain, or in highway conditions, where thermal loads are significantly higher.

Expanding the cooling system in your Mercedes

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, bodies, or coolant flow control modules, check out the available parts in the Mercedes Thermostats and housings category.

If you are considering whether a used or remanufactured part is a better solution in your case, our guide describing the differences between these solutions may be helpful – you can find it here: Remanufactured or used original – which part to choose for repairs?.