Coolant AN Line Upgrade Install

Part Available: TGK Motorsports AN Coolant Line Upgrade Kit

1. Remove Headlight Plastic Covers
   For the S7, remove any plastic covers around the headlights to access the radiator area. This step does not apply to 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
   With the radiator cover 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
   If using a factory intake, remove the two T30 bolts securing the air guide. For aftermarket intakes, use the appropriate Allen 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
   
   
   • Place a suitable coolant catch pan underneath the 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 adapters by double-wrenching each securely. Ensure that each adapter is seated properly to prevent leaks.
   
   
10. Route and Install AN Lines
    
    
    • Route the front coolant line, using both 45-degree and 90-degree connectors.
    • Avoid the factory path; route the lines around the front of the engine and through the center of the core support to the 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 can make it easier to attach the barb fitting before re-securing.
    
    
    
    
12. Refill Coolant
    
    
    • Refill the coolant system with Audi-approved coolant mixed with distilled water according to Audi’s recommended ratios (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 level, as marked on the coolant 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
    
    
    • Jack up the passenger side of the car to assist in removing trapped air from the system.
    • Remove the upper cowl cover, then locate and open the bleed port.
    • Allow coolant to flow steadily from 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.