Follow these steps when it is necessary to drain the coolant from a vehicle for any reason.
1. Place a drain pan under the radiator near the location of the drain valve. It may be necessary to use two drain pans on some vehicles.
2. Remove the radiator cap.
3. Move the drain valve to the release position to allow the coolant to drain into the catch pan. Monitor the flow of coolant until all of the coolant has drained into the pan. Close the valve when this process is complete.