Mercedes W177 AMG Heater Refrigerant Hose A/C Coolant Line A1778307902

Mercedes W177 AMG Heater Refrigerant Hose A/C Coolant Line is an original air conditioning and cooling system component, designed specifically for the W177 AMG model family. Thanks to its factory geometry and fitment to the body mounts, it ensures stable routing of the refrigerant and coolant, which translates into predictable system performance. This is a solution for users who expect consistency with the factory Mercedes design and want to maintain the original air conditioning operating parameters.

Specifications and technical data

• SKU: A1778307902
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1778307902
• Substitutable numbers: A1778307902, A 177 830 79 02
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The described hose belongs to the group of components responsible for transporting refrigerant and coolant within the air conditioning and cooling system. Its task is to:

• guide the working medium between the A/C and cooling system components,
• maintain tightness under varying operating pressures,
• ensure adequate flexibility during powertrain operation and body vibrations.

Thanks to the factory design, the hose works with original brackets and guides, which reduces the risk of chafing, micro-cracks, and leaks in the long term.

Construction and fitment for Mercedes W177 AMG

The hose belongs to the Hoses, lines, and pipes category, meaning it has been designed to operate in high-temperature and high-pressure environments. The construction combines flexible and rigid sections, which allows for:

• precise routing of the cooling lines in the engine bay,
• maintaining proper bending radii without the risk of kinking,
• stable mounting at the points provided by the vehicle manufacturer.

The original Mercedes origin helps maintain the factory quality standard and facilitates integration with other air conditioning and cooling system components in AMG versions.

Performance characteristics and service application

The component is suitable for both standard replacement of a damaged hose and post-accident repairs where it is necessary to restore the original cooling line routing. In practice, this means:

• the ability to recreate the factory routing of lines in the engine bay,
• reducing the risk of collision with other components (engine accessories, electrical harnesses),
• easier diagnostics of potential leaks due to predictable layout.

The used nature of the part allows for an economical approach to repair while maintaining the vehicle manufacturer's original specifications. This is a beneficial solution for workshops specializing in Mercedes service and for users who want to maintain consistency with the factory configuration.

Condition, installation, and practical aspects

The hose is offered as a used part, which means it comes from disassembly and is intended for reinstallation after verification by a mechanic. During installation, it is worth paying attention to:

• proper seating in brackets and guides,
• checking the surface of the connectors for dirt and damage,
• using new seals in accordance with the vehicle manufacturer's service procedure.

This approach increases the chance of maintaining the tightness of the air conditioning and cooling system and reduces the risk of further service intervention in the near future.

System expansion and selection of related components

If you are planning a comprehensive repair or upgrade of the cooling and air conditioning area in your Mercedes and need other elements from the same group, such as additional lines, flexible hoses, or rigid pipes, check the available parts in the Mercedes Hoses, lines, and pipes category.

For users interested in a broader context of selecting used components for turbocharging and air cooling systems in turbocharged engines, an article discussing the practical aspects of choosing turbochargers and their integration with accessories may be helpful – you can find it here: Go-Kart Feeling XXL – comparison of used N18 and B48 turbochargers in Mini Cooper S.