1. Open the hood of your car.
2. Locate the coolant reservoir. It is typically a clear or translucent plastic tank with a black cap. The coolant reservoir is usually located on the driver's side of the engine compartment, near the firewall.
3. Remove the cap from the coolant reservoir. Be careful, as the coolant may be hot.
4. Add antifreeze to the coolant reservoir until the level reaches the "full" mark.
5. Replace the cap on the coolant reservoir.
6. Close the hood of your car.
It is important to use the correct type of antifreeze for your car. The owner's manual for your Audi TT 2001 will specify which type of antifreeze to use.
