Where is the radiator drain cock on 2004 Hyundai Santa Fe?

Look at the bottom or the rear of the radiator

Its a red bolt that has a round head and a slot for a Phillips screwdriver. I found its best to remove the hard plastic under cover which covers the oil pan and transmission pan. Its held on by10mm hex head bolts at least 12 of them. Otherwise the coolant goes everywhere when you drain it.