There is a drain on the bottom....
Need a #3 Phillips driver about 6-8" long..
Look at the subframe rail below the radiator... see the roll stop mount at frame to trans case.... on the driver side of the mount on the frame rail, you will spy (3) holes in the frame,,,,, the forward most hole I think it is will allow you to pass the driver to the drain plug.. unscrew the plug.
the plug will set on the rail while draining...
NOTE -- There is a ruber ring on the plug, majority of time it will stick in the hole, sometimes it will stay with the plug, sometimes it will fall out....
MAKE SURE you know where the ring is,
After draining, install plug back to the radiator
Older plugs is red, newer is teal color.
If you have 2WD V6m you can get to the rear block drain plug with long extension and flex socket to get more coolant out.
Mix your new coolant in 5 gallon pail, I go 1 bottle coolant and a little over 3qt water,,, mix it up, add to cooling system