Assuming you are looking for the temp blend door actuator, remove the center console and you will see the actuator under the dash. It should be white in color.
where is the heater control valve for a 1997 ford expedition
The heater valve is located inside the heater box.
Heat control is by air flow control doors in the a/c and heater box. There is no water valve.
How do you replace a heater core in a 1998 ford expedition?"
doesnt have one
.cv valves are located on top of your engines valve cover.
How do you replace a heater core in a 1998 Ford Expedition?"
Yes
It is located behind the bulkhead, accessible from the engine bay.
If the heater is not working in your Eddie Bauer edition Ford Expedition, your heater core is probably junk and needs to be replaced.
it's up under the manifold on the drivers side. Hunnybunny
You can find a Ford expedition heater parts diagram at most auto-parts stores. You can obtain the heater parts diagram at most Ford dealerships.