Coolant AN Line Upgrade Install

Part Available: TGK Motorsports AN Coolant Line Upgrade Kit

1. Remove Headlight Plastic Covers
   For the S7, remove the plastic covers around the headlights to access the radiator area. This step is not necessary for the S6.
   
   
2. Remove Radiator Cover
   Detach the radiator cover by removing the two plastic pins at the top.
   
   
3. Remove Underneath Plastic Cover
   Once 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
   For factory setups, remove the two T30 bolts holding the air guide. Aftermarket intakes typically use two Allen bolts instead.
   
   
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 a catch container under the vehicle. Using a Phillips-head screwdriver, open the coolant drain plug to let the system drain completely.
   
   
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 adapter by double-wrenching them securely for a tight fit.
   
   
10. Route and Install AN Lines
    The front coolant line includes both 45-degree and 90-degree connectors. Avoid the factory path; instead, route the lines around the engine front and through the center core support to the radiator.
    
    
    
    
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 may make it easier to attach the barb fitting and reattach the hose securely.
    
    
    
    
12. Refill Coolant
    Refill the coolant system with Audi-approved coolant to ensure compatibility. Follow the recommended mixture ratio specified in the owner’s manual.
    
    
13. Bleed Air from the System
    To fully bleed the system, jack up the passenger side of the car. Remove the upper cowl cover, locate the bleed hole, and open it until a steady stream of coolant flows out, indicating all air has been purged. Then, close the bleed hole and reinstall the cowl cover.