Mercedes W204 C207 W212 Coolant Hose Thermostat Line Pipe M274 A2742000115

Mercedes W204 C207 W212 Coolant Hose Thermostat Line Pipe is an original cooling system component from the Cooling system hoses and pipes category, designed for precise coolant routing in M274 series engines. Thanks to its factory geometry and perfect fit for specific Mercedes models, this used hose allows for maintaining stable operating parameters of the thermostat and the entire cooling system, which translates into a safe operating temperature for the engine unit.

Specifications and technical data

• SKU: A2742000115-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2742000115
• Substitutable numbers: A2742000115, A 274 200 01 15, A 274 200 31 00, A2742003100
• Category: Coolant Hoses

Purpose and function in the cooling system

The thermostat hose in the M274 engine is responsible for the directional flow of coolant between the thermostat and other system components. A correctly selected part ensures:

• stable coolant flow under various engine loads,
• maintenance of the proper operating temperature of the engine unit,
• reduced risk of engine overheating or undercooling,
• proper cooperation with the factory thermostat and cooling circuit. Using a hose dedicated to specific Mercedes models minimizes the risk of leaks, material stress, and interference with other components in the engine bay.

Benefits of using an original Mercedes hose

The original thermostat hose for the Mercedes W204, C207, and W212 was designed with the specific architecture of the engine bay in mind. As a result:

• the correct routing path is maintained,
• mounting points and connection diameters are consistent with factory fittings,
• the risk of the hose twisting or kinking during operation is reduced. Choosing a component from the same brand and design group is a solution that facilitates installation and helps maintain the consistency of the entire cooling system according to the manufacturer's specifications.

Product characteristics and condition

The presented thermostat hose belongs to the Cooling system hoses and pipes category and comes from the Mercedes brand. This is a used part, which in practice means an economical repair option while maintaining the original design and fit. This type of component is particularly useful when servicing M274 engines, especially when the existing hose shows signs of wear, material hardening, or leaks. Thanks to its factory origin, the hose maintains compatibility with original clamps, fittings, and mounting brackets, which facilitates the mechanic's work and shortens replacement time.

Selection and application in service practice

When selecting a thermostat hose for the Mercedes W204, C207, and W212, it is crucial to ensure compatibility with the M274 engine and factory parameters. This element is suitable for both standard maintenance replacements and major cooling system service work, such as thermostat replacement or system flushing. In workshop practice, using an original hose eliminates the need for modifications, adjusting diameters or lengths, which translates into a more predictable repair result and a lower risk of post-service complaints.

Expanding cooling system service and additional materials

If you are planning a comprehensive repair or upgrade of the cooling system area in your Mercedes and need other elements from the same group, such as additional hoses, return lines, or sections connecting to the radiator, check out the available parts in the Mercedes cooling system hoses and pipes category. When working on engine operating temperatures, it is also worth paying attention to air conditioning efficiency, as both systems affect driving comfort and engine load. If you want to learn when it pays to choose an original used OEM air conditioning compressor, how to select one, and what to check before installation, read the article: No cooling in the car: an original used air conditioning compressor as a proven alternative.