How to Empty a Radiator in a Car
- 1). Park the vehicle on a level surface.
- 2). If the engine has been running, allow it to cool completely.
- 3). Remove the radiator cap.
- 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 to drain the radiator.