Mercedes W177 W247 Coolant Pipe Heat Exchange Return Hose A2478303800

The Mercedes W177 W247 Coolant Water Hose is an original cooling system component from the Cooling System Hoses and Pipes group, designed for precise coolant circulation within the engine. This used Mercedes component ensures factory-fit connection geometry, correct diameter, and proper mounting alignment, facilitating installation and minimizing leak risks. It's a practical solution for users aiming to restore proper cooling system function without compromising compatibility.

Specifications and technical data

• SKU: A2478303800
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2478303800
• Substitutable numbers: A2478303800, A 247 830 38 00
• Category: Coolant Hoses

Function and Role in the Cooling System

The coolant water hose in Mercedes W177 and W247 models is responsible for the controlled transport of coolant between system components such as the engine block, radiator, and intermediate modules. A correctly fitted hose:

• maintains stable coolant flow in the required direction,
• ensures proper connection sealing thanks to the correct end profile,
• minimizes the risk of engine overheating,
• operates within the temperature range typical for modern internal combustion engines.

By retaining its original design, the hose works with factory clamps and connectors, contributing to the predictable performance of the entire cooling system.

Compatibility and Fitment for Mercedes W177 / W247

The coolant water hose has been specifically designed for the engine bay architecture of Mercedes W177 and W247 vehicles. This means that:

• the hose routing follows the factory path,
• support and mounting points correspond to original brackets,
• the hose shape accounts for the proximity of other components (covers, wiring harnesses, body elements).

This precise fitment reduces material stress, minimizes the risk of abrasion, and simplifies future servicing, as the system remains consistent with manufacturer documentation.

Characteristics of the Used Component

The offered hose is a used part, allowing for a favorable purchase price while retaining original design specifications. The used component:

• maintains factory geometry and connection diameters,
• is suitable for use as a replacement in standard repairs,
• allows for maintaining cooling system integrity with other OEM components.

For many Mercedes vehicle owners, this is a sensible choice when the goal is to restore system functionality while maintaining compatibility with manufacturer solutions.

Benefits of Using an Original Cooling Hose

Replacing a worn or leaking coolant water hose with an original part offers a range of practical benefits:

• stable engine operating temperature due to proper coolant flow,
• reduced risk of failures resulting from engine overheating,
• easier diagnostics and servicing due to the preservation of the factory hose layout,
• no need for modifications or fitting universal hoses.

For workshops and individual owners, this translates to faster installation and predictable repair outcomes, which is important for both daily driving and prolonged vehicle use.

Related Cooling System Components and Technical Knowledge

Replacing a coolant hose often involves inspecting other system components such as the radiator, thermostat, or fans. To better understand the impact of ambient temperature on the efficiency of the entire system and the potential savings from using used parts, it's worth reading the guide: Summer Heat vs. Cooling System: Used Radiators and Fans Guarantee Savings.

If you are planning a comprehensive repair or upgrade of the cooling system area in your Mercedes and need other parts from the same group, such as additional pipes, return hoses, or connections to the radiator, check the available parts in the category Mercedes Cooling System Hoses and Pipes.