I need to drain the radiator of my '01 SLS but am not sure where the drain is. Do I have to remove that black plastic cover under the radiator or is it that 'thing' that can barely be reached through a hole on the drivers side? Thanks

 

Thanks anyway everyone, I found the source of my radiator leak is the overflow tank, there is a small slit/pin hole leak. I will either replace the tank or plug the hole in some manner.