Where is the new Chevrolet Sail water tank drainage raft?

The new sail has no water tank drain valve. To drain water, lift the car or open a maintenance pit, and unplug the return pipe near the radiator. When adding new antifreeze, it should be noted that after filling the kettle, start the engine to refuel until the speed is about 3000, raise the engine temperature, and then fill the kettle after the thermostat starts a big cycle.