It seems these 2007-2013 GM lambar do not have drain plug.
There is no drain plug, remove the lower radiator hose to drain coolant.
The 2004 GMC radiator drain is located on the bottom of the radiator. The radiator drain plug can be removed with a half inch ratchet.
There is no plug for the radiator, you have to take out the lower hose from under the car and let the radiator drain.
Bottom of the radiator.
there isn't a radiator drain plug. you have to remove the lower radiator hose from the radiator to do a drain and fill.
Look atr bottom or rear of radiator
bottom driver side of radiator
Look either at the bottom of radiator or on the rear of the radiator bottom
On a 2001 GMC Savana 5.7 V8. There is no drain plug. You actually have to remove the big hose that joins the engine to the radiator. This will drain out all the fluids.
There is a turn plug on the rightside of the bottom of a radiator turn it and it will drain.
After opening the hood, look down the right side of the radiator. (the side with the radiator cap) The drain plug is at the bottom facing the rear of the vehicle. No need to remove it, only loosen.