Coolant Hose Mercedes W204 C207 W212 M274 Thermostat Line Pipe A2742000115

Coolant Hose Mercedes W204 C207 W212 M274 Thermostat Line Pipe is a component from the Cooling system hoses and pipes group, designed to operate in the coolant circulation circuit between the thermostat and other system components. This used, original Mercedes part ensures proper coolant flow, stabilizing the operating temperature of the M274 engine in W204, C207, and W212 models. It is a practical solution for users looking for a technically matched component at a reasonable price.

Specifications and technical data

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

Function and role in the cooling system

The thermostat hose in the M274 engine is responsible for the controlled routing of coolant between the thermostat and the rest of the system. A properly selected hose:

• ensures a tight connection of cooling system components,
• maintains stable fluid flow under typical operating loads,
• reduces the risk of engine overheating,
• supports the correct operation of the thermostat and radiator.

Thanks to its proper shape and diameter, the hose works with factory connectors, which translates into a secure fit for the Mercedes cooling system in the mentioned body generations.

Compatibility with the M274 unit and W204, C207, W212 bodies

The described hose has been designed to work with the M274 engine used in Mercedes C-Class (W204), E-Class (W212), and the C207 coupe version. This means that the hose geometry, its length, and mounting points are adapted to the factory routing in the engine bay.

In practice, this translates into:

• easier installation without the need for modifications,
• maintaining the original hose routing in the engine bay,
• lower risk of collision with other components (engine accessories, wiring harnesses, housings),
• maintaining factory cooling system operating parameters.

Characteristics of the used Mercedes part

The offered hose belongs to the group of original Mercedes components, which means compliance with the manufacturer's factory design standards. A used part is a good solution for drivers who want to maintain the original cooling system specification while optimizing repair costs.

Choosing a hose from dismantling allows you to:

• maintain system consistency with other cooling elements,
• preserve factory mounting and routing points,
• reduce the risk of fitment issues typical of aftermarket parts with universal geometry.

The importance of the correct thermostat hose for engine durability

A functional thermostat hose has a direct impact on the thermal safety of the M274 unit. Leaks, loss of wall rigidity, or hose deformations can lead to coolant loss, local overheating, and accelerated wear of engine components. Using a properly selected hose from the Cooling system hoses and pipes group helps maintain a stable operating temperature and reduce the risk of failure.

For users operating the car in urban and highway conditions, this is particularly important during periods of high ambient temperatures, when the cooling system works under greater load.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional lines, hoses, or coolant connectors, check out the available parts in the Mercedes cooling system hoses and pipes category.

To better understand how summer conditions affect the efficiency of lines, hoses, and other cooling system components, it is worth checking our guide: Summer heat vs. cooling system: used radiators and fans as a guarantee of savings, where we discuss practical aspects of operation and the selection of parts from dismantling.