Audi A4 RS4 B8 Headlight Lamp Drain Hose Pipe Line Tube Left N/S 8T0941717D

Audi A4 RS4 B8 Headlight Lamp Drain Hose Pipe Line Tube Left N/S is a specialized component from the Cooling system pipes and hoses group, responsible for the proper ventilation of the left-side headlight. A correctly selected hose ensures stable operating conditions for the lamp, reduces the risk of lens fogging, and supports the trouble-free operation of the system in demanding operating conditions.

Specifications and technical data

• SKU: 8T0941717D-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8T0941717D
• Substitutable numbers: 8T0941717D, 8T0 941 717 D
• Location on the vehicle: Left
• Category: Coolant Hoses

Purpose and technical function

The presented ventilation hose has been designed for the precise supply and discharge of air within the headlight on the left side of the vehicle. Its task is to stabilize pressure and drain moisture, which reduces water vapor condensation inside the lamp and helps maintain the clarity of the lens. Thanks to its dedicated shape and matched ends, the component works with factory sockets in the headlight and the body, which facilitates installation and minimizes the risk of leaks. Proper routing of the hose is important both for the durability of the lamp itself and for the stability of the electrical system in its vicinity.

Compatibility and installation fit

The hose is intended for installation on the left side of the vehicle, which eliminates the problem of choosing the side and helps avoid mistakes when ordering. The design of the hose is adapted to the geometry of the headlight housing and adjacent body elements, so that after proper seating, it does not interfere with other components. As an element from the Cooling system pipes and hoses group, it meets the standards used by the vehicle manufacturer, which helps maintain the consistency of the entire system under the hood. In practice, this means predictable material behavior at varying temperatures and correct interaction with neighboring components.

Performance characteristics of the used component

The offered hose comes from dismantling, which allows for maintaining the original geometry and mounting method consistent with factory specifications. A used component of this type is particularly attractive where fitment to a specific headlight model and maintaining the original stiffness and flexibility of the hose are important. In practice, the use of an original, used ventilation hose allows for reducing the risk of leakage problems that may occur with cheap replacements of simplified construction. This is a recommended solution for repairs where the priority is to maintain the factory logic of hose routing and lamp stability.

The importance of proper headlight ventilation

A functional ventilation hose has a direct impact on driving comfort and safety. Reducing fogging inside the headlight improves the quality of the light beam, which translates into better road visibility and readability of signs. At the same time, stable operating conditions for the lamp reduce the thermal and moisture load on optical and electrical components. In the case of modernization or repair of the lighting system, it is worth treating the replacement of ventilation hoses as an integral part of the entire process, especially when the headlight has been disassembled before or symptoms of excessive moisture have appeared. If you are planning a comprehensive repair or modernization of the cooling system and hose routing area in your Audi and need other elements from the same group, such as flexible pipes, connectors, or additional auxiliary hoses, check the available parts in the Audi cooling system pipes and hoses category.

Technical support and part selection

When selecting elements from the pipes and hoses group, it is worth paying attention to compatibility with the cooling system and adjacent components to avoid stress and leaks. It may be helpful to use the vehicle manufacturer's markings and compare the shape and mounting method with the dismantled element. If you want to better understand why components of the cooling system sensitive to temperature and pressure – including pipes, hoses, and cooperating elements – should be selected with greater care than cheap replacements, read the article: Cooling system failure: why is an original used radiator a safer choice than a cheap replacement?.