Mercedes W164 AMG Coolant Hose Expansion Tank Line To Radiator Top A1645013882

Mercedes W164 AMG Coolant Hose Expansion Tank Line To Radiator Top is an original cooling system component, designed specifically for W164 series AMG models. It enables stable fluid flow between the expansion tank and the top of the radiator, which supports proper heat dissipation from the power unit and reduces the risk of engine overheating. Thanks to its factory geometry and connector diameters, the hose ensures a precise fit to the factory installation without the need for modifications.

Specifications and technical data

• SKU: A1645013882
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1645013882
• Substitutable numbers: A1645013882, A 164 501 38 82
• Category: Coolant Hoses

Function in the Mercedes W164 AMG cooling system

This hose is responsible for transporting coolant from the expansion tank to the top of the radiator, stabilizing fluid levels and facilitating system bleeding. In AMG vehicles, where the engine operates under higher thermal loads, a functional hose and cooling system lines are crucial for maintaining the correct operating temperature and protecting seals, the cylinder head, and engine accessories.

A properly selected hose minimizes the risk of:

• leaks at the connections with the tank and radiator,
• pressure drops in the cooling system,
• localized overheating resulting from air trapped in the circuit.

Construction and fitment for the AMG installation

The hose has been designed as a factory component for the W164 platform in AMG versions, maintaining the correct length, shape, and operating diameter. As a result:

• the hose routing is consistent with the original brackets and guides in the engine bay,
• there is no stress on the expansion tank and radiator connectors,
• proper fluid circulation is maintained in the upper part of the cooling system.

Such fitment promotes stable cooling system operation even during dynamic driving, frequent acceleration, and high RPMs typical of AMG versions.

Benefits of using an original hose

Choosing the original hose for Mercedes W164 AMG translates into a number of practical service and operational benefits:

• preservation of the factory coolant flow characteristics,
• easier installation thanks to compatibility with original connectors and brackets,
• reduced risk of improper hose positioning in the engine bay.

For workshops and users, this means shorter installation time and greater reliability of the cooling system after replacing the component.

Component condition and service application

The offered hose belongs to the Cooling system hoses and lines group and is intended for service applications in Mercedes W164 AMG vehicles that have shown signs of wear on flexible system elements (cracks, brittleness, signs of leaks). Replacing the hose with an original component is recommended especially during:

• repairs after engine overheating,
• comprehensive cooling system maintenance (replacing the radiator, tank, clamps),
• preventive maintenance in vehicles operated under high loads.

Technical support and knowledge about the cooling system

To better plan the maintenance of the cooling system in your car and understand the impact of individual components on engine durability, it is worth checking out the guide: Engine cooling system – overheating, repair, and used radiators. The article discusses practical aspects of diagnostics and service, also useful when working with Mercedes models.

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 return lines, lower hoses, or flexible radiator supply sections, check out the available parts in the Mercedes cooling system hoses and lines category.