No hose connects from the air intake to the radiator. It may connect to a bracket mounted not the radiator but it does not connect to the coolant. If that is what you are stalking about it is called an air intake tube.
That connects the engine to the radiator is simply referred to as a hose. The radiator is connected to the engine by two hoses.
Air intake plenum.
That would normally be the thermostat housing
A water pump? In all vehicles that I've had and know of. Your radiator has an intake and an outtake, Your intake goes from the radiator, to the thermostat, the thermostat connects usually directly to the water pump or only has a few inch distance from that.. It circulates the coolant around / in the block. and feeds it out of the block usually on the opposite side, it registers on your vehicles thermometer (the thing that tells you your engine temp) and back in to the radiator.
You have a top radiator hose and a bottom radiator hose.
lower radiator hose
thersmostat
It is the transmission cooler hose or line. It runs the fluid through a cooler on the radiator to cool the transmission fluid.
heater hose?
Yes, the 1989 Ranger does have a PCV valve. I can speak for the 2.3 liter 4-cylinder version only. If you stand on the driver side of the engine compartment you will see the intake manifold (silver cast looking with the name FORD on it), on the bottom of the intake there is a 90 degree elbow (the intake forms a "Y" and if you look through the "Y" you can see the elbow) that points back toward the firewall. Connected to this is a rubber hose that routes back toward the firewall and then turns down at the firewall-side of the intake. If you follow this hose along you will come to the PCV valve. The valve is installed in the hose and connects to another rubber hose on the other side of the PCV valve. Hope this helps.
If you're talking of a 5/8" id hose shaped in a U -- that's the bypass hose. If you're talking of a 5/8" id hose shaped in a U -- that's the bypass hose.
Thermostat housing