Where can I purchase a heater control vlave?

there's a door that'd need to be fixed looked it up and alot of places stated there is no such part

I wish I could give a better answer, but it looks like salvage yards are gonna be the only hope. I am looking for the same part right now, and I am certain that the part exists, as I just pulled my broken one out of my 99 Dodge Ram Van 3500 with a 5.9.