I have a 2001 sts and I cant seem to find a drain plug on the bottom of my radiator, come to think of it, I cant see the bottom of the radiator. When doing a coolent change, do I just disconnect the lower radiator hose and let it drain or is there a plug?

There is a hole in the bottom of the splash shield. The plug is above it on the drivers side.

If its the same as 99, use a 19mm hex head socket and unscrew it. Have your drain pan handy. My follies doing this are here:

http://www.cadillacforums.com/forums/cadillac-seville-cadillac-eldorado-forum/127701-99-sts-coolant-change-still-more.html