Well, these don't have or need cylinder drain plugs so that's not a concern. Per the manual, you just pop the radiator cap and loosen the one drain bolt by the water pump, then when refilling it, there are bleeds on the tops of the thermostat housing on the cylinders that need opened when refilling. Soon as the air is out and coolant comes out of those, shut them and finish filling to the top. Run it long enough to open the thermostat(s) with the cap off, fill to top and recap. Fill the recovery tank between the low and high marks. That's it.