How to Drain a Radiator in an Audi

1. Park the vehicle on a flat surface.
2. If the engine has been running, allow it too cool completely.
3. Remove the radiator cap. On older vehicles it will beon the top of the radiator. On newer vehicles it will be on the coolant expansion tank.
4. Locate the petcock valve on the lower corner of the radiator.
5. Place a waste oil collection pan underneath the petcock valve.
6. Open the petcock valve by turning it counterclockwise.
7. Allow the radiator to drain completely.
8. Turn the petcock valve clockwise to close it.