Coolant AN Line Upgrade Install

Part Available: TGK Motorsports AN Coolant Line Upgrade Kit

1. Remove Headlight Plastic Covers
   For the S7, remove theany plastic covers around the headlights to access the radiator area. This step isdoes not necessaryapply forto the S6.
   
   
2. Remove Radiator Cover
   Detach the radiator cover by removing the two plastic pins at the top. Set the cover aside.
   
   
3. Remove Underneath Plastic Cover
   OnceWith the radiator cover is removed, locate and unscrew the three T30 bolts beneath it to detach the additional plastic cover.
   
   
4. Remove Intake
   Remove the intake to access the coolant lines and components.
   
   
5. Remove Intake Air Guide
   ForIf using a factory setups,intake, remove the two T30 bolts holdingsecuring the air guide. AftermarketFor intakesaftermarket typicallyintakes, use twothe appropriate Allen bolts instead.wrench.
   
   
6. Remove Splash Shields
   Pull back or remove the splash shields beneath the vehicle to access the lower cooling system components.
   
   
7. Drain Coolant
   
   Position
   • Place a suitable coolant catch containerpan underunderneath the vehicle.car and ensure the engine is cool to avoid burns.
   • Carefully open the coolant reservoir cap with a cloth to relieve any pressure, preventing hot coolant from spraying.
   • Using a Phillips-head screwdriver, open the coolant drain plug to let the system drain completely.
     
     

   WARNING: The cooling system will require additional tools for full draining and filling; follow Audi’s coolant filling and bleeding procedures to prevent air pockets and overheating.

   
   
8. Disconnect OEM Coolant Lines
   
   Lift up on the release tabs of the OEM coolant lines, then pull them straight out to disconnect. Expect some residual coolant to drain out, so keep a rag or container ready.
   
   
   
   
9. Install AN Adapters
   
   Install the AN adapteradapters by double-wrenching themeach securelysecurely. forEnsure athat tighteach fit.adapter is seated properly to prevent leaks.
   
   
10. Route and Install AN Lines
    
    The
    • Route the front coolant lineline, includesusing both 45-degree and 90-degree connectors.
    • Avoid the factory path; instead, route the lines around the front of the engine front and through the center of the core support to the radiator.radiator for optimal clearance and fit.
      
      
    
    
    
11. Connect to Coolant Crossover Line
    
    Use the supplied barb fitting to attach the AN line to the coolant crossover line on the passenger side. Tip: Temporarily removing the rubber crossover hose maycan make it easier to attach the barb fitting andbefore reattach the hose securely.re-securing.
    
    
    
    
12. Refill Coolant
    
    
    • Refill the coolant system with Audi-approved coolant mixed with distilled water according to ensureAudi’s compatibility.recommended Followratios (e.g., 50% coolant and 50% water for most regions - using distilled water prevents mineral deposits and corrosion)
    • Fill the system up to the recommended mixturelevel, ratioas specifiedmarked inon the owner’scoolant manual.reservoir.
      
      

    Note: Use the VAS6096 or similar coolant filling tool if available to eliminate air pockets during the refill process.

    
    
13. Bleed Air from the System
    
    To fully
    bleed the system, jack
    • Jack up the passenger side of the car.car to assist in removing trapped air from the system.
    • Remove the upper cowl cover, then locate and open the bleed hole,port.
    and open it until a steady stream of
    • Allow coolant flowsto out,flow indicatingsteadily all air has been purged. Then, closefrom the bleed hole until no air bubbles are visible.
    • Secure the bleed port and reinstall the cowl cover.
      
      

    Important: Once the system is bled, run the engine as specified in Audi’s service guide, typically at idle and then at 2000 RPM, to circulate coolant fully and confirm no air pockets remain.

    
    

Following these detailed steps should ensure a secure, leak-free installation of the TGK AN coolant lines. Refer to TGK Motorsports and Audi’s maintenance manuals for additional insights and troubleshooting support.