Coolant Hose Mercedes W204 Petrol M274 Engine Cooling Water Line A2742000782

Coolant Hose Mercedes W204 Petrol M274 Engine Cooling Water Line is an original cooling system component designed for the M274 series petrol engines in Mercedes W204 models. This specialized water hose ensures proper coolant flow, supporting stable engine operating temperatures and safe operating conditions. Thanks to its factory geometry and fitment, it serves as a practical solution for cooling system repairs and maintenance.

Specifications and technical data

• SKU: A2742000782
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2742000782
• Substitutable numbers: A2742000782, A 274 200 07 82
• Fuel type: Petrol
• Category: Coolant Hoses

Purpose and function in the cooling system

The described hose belongs to the Cooling system hoses and pipes category, responsible for transporting coolant between key engine components and accessories. For M274 petrol units in the Mercedes W204, a correctly selected water cooling pipe is essential for:

• maintaining a stable operating temperature of the petrol engine,
• ensuring proper pressure within the cooling circuit,
• reducing the risk of overheating under heavy loads,
• maintaining the tightness of connections throughout the entire fluid flow path.

The correct shape and diameter of the hose ensure proper compatibility with connectors, housings, and other cooling system components, facilitating installation and subsequent operation.

Benefits of using an original Mercedes hose

Using a hose dedicated to the M274 petrol engine in the Mercedes W204 allows for maintaining the factory cooling system performance parameters. The most important advantages include:

• Precise geometric fit – the hose is designed for a specific routing in the engine bay, which minimizes stress and the risk of rubbing against other components.
• Stable coolant flow – the properly selected diameter and length of the hose support uniform cooling of the engine unit.
• Compatibility with petrol engine accessories – the hose works with the cooling system designed for this powertrain configuration.
• Suitability for staged repairs – the component is suitable both for replacing a single section and for more extensive cooling system servicing.

Component condition and service application

The water cooling hose is offered as a used part, which provides a reasonable compromise between repair costs and maintaining the manufacturer's original specifications. This type of component is particularly useful in situations where:

• the existing hose has cracked, delaminated, or shows visible signs of wear,
• a quick replacement of a damaged section of the cooling system is necessary,
• the priority is to maintain the original design and routing of hoses in the engine bay.

For M274 petrol engines in the Mercedes W204, using the correct water hose helps reduce the risk of overheating, which has a direct impact on engine durability and driving comfort.

Technical support and additional information

When working on the cooling system, it is worth paying attention to the general condition of other hoses, clamps, and fasteners to avoid recurring issues shortly after. It is also good practice to check the level and quality of the coolant after any intervention in the circuit.

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 flexible water hoses, rigid cooling pipes, or fluid return sections, check the available parts in the Mercedes cooling system hoses and pipes category.

To better understand the impact of a functional coolant circuit on engine lifespan and the symptoms of overheating, it is worth reading our guide: Engine cooling system – overheating, repair, and used radiators. This will help you plan the scope of service work and select the right components for your car.