Coolant Hose Mercedes W204 Petrol M274 Left N/S Radiator Water Line A2045018782

Coolant Hose Mercedes W204 Petrol M274 Left N/S Radiator Water Line is an original cooling system component from the Cooling system hoses and pipes group, designed for use in Mercedes vehicles with petrol engines. Designed as a dedicated water line, it ensures stable coolant flow and proper supply to the water circuit on the left side of the engine bay.

Specifications and technical data

• SKU: A2045018782
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045018782
• Substitutable numbers: A2045018782, A 204 501 87 82
• Location on the vehicle: Left
• Fuel type: Petrol
• Category: Coolant Hoses

Purpose and function in the cooling system

The presented water hose operates within the coolant circuit, responsible for the safe discharge and supply of fluid in a specific section of the system. Its design is matched to the geometry of the M274 engine unit, which facilitates proper routing of the hose in the tight space of the engine bay and limits the risk of chafing or incorrect positioning.

The component is prepared for installation on the left side of the vehicle, which is important for fitting to factory brackets, connectors, and other cooling system components. This maintains the factory fluid flow path, and the entire system operates under stable temperature conditions.

Compatibility with the M274 petrol unit

The hose has been developed for use with the M274 petrol engine, meaning it is adapted to the characteristic operating temperatures, pressures, and component layout of this unit. Using a hose that is structurally consistent with the original design reduces the risk of leaks, excessive stress, and improper cooling.

By maintaining the factory geometry of the hose, it is possible to:

• ensure proper coolant flow in critical areas of the engine,
• maintain the correct bending radius without kinking,
• facilitate easier installation in existing brackets and guides.

Characteristics of the used component

The offered hose is a used part, sourced from dismantling, which is a cost-effective solution for users looking for original components at a reasonable price. This type of part allows for maintaining consistency with the factory cooling system design, without the need to resort to replacements of uncertain geometry or build quality.

Choosing an original, used water hose is particularly important in the case of precisely designed petrol units, where even small deviations in the shape or length of the hose can affect the installation and durability of the entire system.

The importance of the correct hose in the cooling system

A functional water hose has a direct impact on the stability of the engine's operating temperature and, consequently, its service life. Leaks, micro-cracks, or incorrect hose positioning can lead to fluid loss, engine overheating, and secondary damage. Therefore, when replacing, it is worth choosing components that are structurally consistent with the original, dedicated to the specific fuel type and system.

If you want to better understand how the selection of cooling system components affects engine durability and what symptoms may indicate problems with the fluid circuit, check out the article Engine cooling system – overheating, repair, and used radiators, which discusses practical aspects of diagnostics and repair.

Cooling system expansion and related parts

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 pipes, return hoses, or sections connecting to the radiator, check out the available parts in the Mercedes cooling system hoses and pipes category.

In the case of older vehicles, where the availability of new components is sometimes limited, it is worth considering a wider use of parts from dismantling. You can read about the advantages of such a solution – including cost optimization and the ability to keep the car in full working order despite shortages at authorized service centers – in the guide No parts at the dealership? How to handle repairs of older models using parts from dismantling.