I tried to change the coolant in my 2002 Nissan Frontier V6, all I >did
> was open the drain screw and the radiator cap, and emptied the
> overflow reservoir. In my other cars, that's all I had to do. Only > a
> bit over a gallon came out. The capacity is supposed to be 11-5/8
> quarts. What else do I have to do to get the rest of the coolant > out?
Remove the lower radiator hose from the radiator.
Ed