Audi A7 4G Water Cooling Coolant Hose Pipe Line Rear Left N/S 4G0122109

Audi A7 4G Water Cooling Coolant Hose Pipe Line Rear Left N/S is an original component from the Cooling system hoses and pipes group, designed for precise coolant routing in the rear section of the vehicle. Thanks to its factory-fit design for the Audi A7 4G generation, it ensures a stable connection within the cooling system and helps maintain the correct engine operating temperature.

Specifications and technical data

• SKU: 4G0122109
• Mark: Audi
• Condition: Used
• OEM Part Number: 4G0122109
• Substitutable numbers: 4G0122109, 4G0 122 109
• Location on the vehicle: Rear, Left
• Category: Coolant Hoses

Purpose and function in the cooling system

This coolant hose has been designed specifically for the Audi A7 4G as a component responsible for transporting coolant in the rear left section of the vehicle. The vehicle placement, defined as rear – left side, facilitates the identification of the correct section of the installation during diagnostics and replacement.

The component operates within the coolant circuit, contributing to a leak-free and efficient system. A correctly selected hose reduces the risk of leaks, pressure drops, and localized overheating, which translates into stable operation of the power unit and other components dependent on the cooling system.

Construction and fitment for Audi

As an Audi brand part, the hose is structurally matched to the factory mounting points and connector diameters in the A7 4G model. This means:

• a properly shaped path that avoids sensitive body and suspension elements,
• compatible ends allowing for a tight connection with other sections of the cooling installation,
• geometry adapted for operation in the limited space of the vehicle's rear section.

Such fitment facilitates installation without modifications and allows for the preservation of the original cooling system architecture, which is important for both reliability and subsequent maintenance.

Used condition and benefits of using OEM parts

The offered hose is a used component, sourced from dismantling, which allows for economical repair while maintaining the manufacturer's original specifications. Unlike replacements with universal geometry, the OEM part ensures proper coolant flow and compliance with Audi's factory requirements.

Choosing an original cooling system hose is particularly important in vehicles equipped with extensive thermal systems, where even minor deviations in shape or diameter can affect the durability of other components. Using this element helps restore proper fluid circulation and reduces the risk of repeated interventions in the system.

Practical installation and operational tips

When replacing the hose in the rear left part of the cooling system, it is worth:

• checking the condition of adjacent hoses and clamps,
• performing a leak test after the first engine start and system bleeding,
• monitoring the coolant level during the first operating cycles after installation.

Such an approach allows you to fully utilize the potential of the original hose and minimize the risk of unplanned vehicle downtime related to the cooling system.

If you are planning a comprehensive repair or upgrade of the cooling system area in your Audi and need other elements from the same group, such as additional lines, hoses, or connecting sections, check the available parts in the Audi cooling system hoses and pipes category.

More about the cooling system and the use of used parts

To better understand the impact of an efficient cooling system on engine lifespan and the symptoms of overheating, it is worth reading the guide: Engine cooling system – overheating, repair, and used radiators. You will find practical tips there that will help you assess the condition of the cooling installation in your car.

If you want to maximize the potential of dismantled parts and ensure their long-term operation, the material dedicated to the maintenance of used components will also be helpful: How to extend the life of used car parts?.