This is used on cars equipped with factory A/C to stop the flow of warm coolant when the A/C is on. Not an exact replacement, but it will work just fine.
These valves are normally set to open. This is a good quality reproduction of the service replacement part used on many FoMoCo models throughout the 1970s. Notice it has a plastic body, origin production line parts featured a brass body.
Replaces Service Ford part #: D4AZ-18495-A.