I know NOTHING specific about your truck, but it IS common for some systems to simply use a "blend door" to route the airstream away from the heater core when heat is not desired with NO need for a water shutoff valve.
Then, I went to the Rock Auto parts lookup website and they DO list a vacuum operated water valve for a 2000 F250 (I looked it up as the 5.4 gas engine, specifically).
Have you had a look to see if there's a valve in one of the heater hoses? Then, check the vacuum line to it for damage and connect a vacuum gauge to the line and look for a change of state (vacuum/no vacuum)as the temperature control is moved between hot and cold.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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