On the front side (facing the radiator) of the thermostat housing, two hoses are attached. One is the upper radiator hose; the other, below it, makes a right angle turn and connects to a pipe that disappears below/behind the exhaust manifold.
Does anybody know the part number of this 2nd hose? No luck on eBay, Amazon, Rock Auto, Ford Genuine Parts, or Gates.
I'm guessing that this hose is simple enough that it's meant to be "cut to fit" from a large roll.
Problem is i don't know its diameter and my local Advance Auto Parts doesn't carry "cut what you need" generic lengths of right angle hose.