Thanks to this forum I found the radiator drain. It's like the others said. You have to remove the plastic oil pan cover to get at anything. After that, you look up through the frame rail to find the drain plug and insert a screwdriver through the frame rail to loosen the drain plug. The coolant is going to drip all over so have an extra large tub to catch it all. It is a slight pain in the butt unless you're lucky enough to have a lift and get up in there.