One stop purchase auxiliary water tank water pipe 06L 121 081 AD for FAW Audi A6 Avant

Standard Coolant Reservoir Vent Pipe for Bulk Wholesale

100% OEM Exact Fit, Direct Plug-and-Play Installation Without Modification

Full Compatible Vehicle List

1. Domestic FAW Audi A6 Avant C8 chassis (2019–2025) 40 TFSI, 45 TFSI, 55 TFSI quattro & 2.0T PHEV
2. Shared MLB Evo platform models: Audi A4 B9, A5 F5, Q5 FY, S6 C8, Porsche Macan 95B 2.0T

Matching Powertrains

Installation Position

Optimized Heavy-Duty Structural Design

1. Multi-layer reinforced EPDM composite pipe body: Excellent resistance to high temperature, coolant corrosion and aging, avoiding deformation or cracking under long-time 105℃+ working temperature
2. Integrated injection molded quick-lock plastic connectors: Tight sealed connection with expansion tank and engine pipe ports to eliminate liquid leakage risks
3. Built-in high-temperature fluorine rubber sealing gaskets at both ends: Anti-oil, anti-hardening, stable sealing performance for long service cycle
4. Pre-formed positioning buffer rubber sleeves: Reduce pipeline vibration friction damage during vehicle driving
5. Complete one-piece finished water pipe assembly, matched with original style fixed buckles for direct replacement

Core Engine Cooling Protection Functions

1. Discharge trapped air bubbles inside the cooling system to eliminate air lock and prevent engine local overheating
2. Balance coolant volume expansion caused by temperature rise, avoid coolant overflow loss from auxiliary water tank
3. Stabilize overall cooling circuit pressure during cold startup and high-load driving
4. Ensure smooth coolant circulation of heater core to supply stable hot air for cabin heating in cold weather
5. Protect auxiliary water tank from excessive pressure impact to extend the service life of expansion tank assembly

Common Solvable Vehicle Faults

• Coolant liquid level keeps dropping without obvious external leakage points
• Coolant fault light lights up repeatedly on dashboard after refilling antifreeze
• Engine temperature rises abnormally during traffic jams or long-distance high-speed driving
• Insufficient warm air blown out from air outlets in low temperature environment
• Coolant wet stains appear around the auxiliary water tank pipeline joints

Brief Step-by-Step Installation Guide

Required Tools

1. Park vehicle on flat ground, turn off engine and wait for complete cooling to prevent scalding from hot coolant.
2. Locate the vent pipe connected to the auxiliary water tank, release the quick lock buckles on both pipe ends.
3. Slowly pull down the aged original water pipe, collect residual coolant into sealed container.
4. Wipe clean the connecting ports of expansion tank and engine pipeline, remove residual aging rubber gasket debris.
5. Spread thin layer of sealing lubricant on gaskets of new 06L121081AD water pipe, insert dual-end connectors firmly until "click" locking sound is heard.
6. Install fixed buffer rubber sleeves and positioning buckles to fix pipeline on engine bay brackets, avoid shaking friction.
7. Refill fresh special coolant into auxiliary water tank, start engine and idle for 10 minutes to fully bleed air from cooling loop.
8. Inspect all pipe joints carefully for coolant seepage, confirm the coolant warning light does not light up during driving test.

Strict Factory Testing & Stable Spot Supply