I have a leak in the nipple that comes out of the radiator which is next to the drain plug. I squeeze the hose and nothing comes out,then i squeeze the plastic nipple same result. After a while it gets wet again with coolant. Is it the hose or the radiator. Also does anyone have a part number to that hose in case I have to replace it. And the other picture shows 2 hoses connected to a pipe fitting what is that for. This is a 2007 model.