Coolant Hose Mercedes W166 Diesel OM642 Radiator Water Hose Left N/S A1665000475

Coolant Hose Mercedes W166 Diesel OM642 Radiator Water Hose Left N/S is an original cooling system component designed for diesel engines. It ensures stable coolant flow between the radiator and other components, maintaining the proper operating temperature of the power unit. Thanks to its factory-fit design for the Mercedes W166, the hose guarantees secure installation, leak-tightness, and proper fluid circulation on the left side of the engine bay.

Specifications and technical data

• SKU: A1665000475
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1665000475
• Substitutable numbers: A1665000475, A 166 500 04 75
• Location on the vehicle: Left
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and function in the cooling system

The hose belongs to the Cooling system hoses and pipes group and operates in the coolant circuit between the radiator and engine components. Its placement on the left side of the vehicle allows for precise fluid routing in an area subject to significant temperature fluctuations and limited installation space.

In diesel engines, the cooling system is under significant load, which is why a properly selected water hose is crucial for:

• maintaining a stable operating temperature of the power unit,
• preventing overheating during high loads and highway driving,
• maintaining proper pressure in the coolant circuit,
• reducing the risk of leaks in the critical area near the radiator.

Compatibility with Mercedes W166 Diesel

The offered hose has been designed specifically for the Mercedes W166 platform with a diesel engine, ensuring compatibility with the factory engine bay geometry and mounting points. This ensures:

• proper hose routing relative to the radiator and other auxiliary components,
• appropriate bending radii to minimize material stress,
• collision-free operation with the fan, covers, and body elements.

Such a fit reduces the need for modifications and allows for quick, predictable replacement in service conditions.

Characteristics of the used coolant hose

The item comes from dismantling and is offered as a used part, which is a cost-effective solution while maintaining the manufacturer's original specifications. In practice, this means:

• retention of the factory shape and connection diameters,
• compatibility with original clamps and connectors,
• possibility of installation in place of a worn or damaged hose without additional adaptations.

Choosing an original, used hose is particularly attractive for complex cooling systems in diesel engines, where both fitment and repair cost control are important.

The importance of the correct hose in diesel operation

In diesel engines, stable cooling system operation affects the durability of the cylinder head, seals, and turbocharger. A functional hose on the left side of the radiator helps maintain:

• even fluid distribution throughout the entire circuit,
• proper heat exchange in the radiator,
• safe operating conditions under prolonged thermal load.

Thanks to this, replacing a worn component with an original coolant hose dedicated to the Mercedes W166 is an essential stage of any professional cooling system service.

Cooling system service expansion and additional materials

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

To better plan your service, it is worth learning about the impact of temperatures on the entire cooling circuit – you will find practical tips in the guide "Summer heat vs. cooling system: used radiators and fans as a guarantee of savings", which discusses the operation and selection of cooling components in demanding conditions.