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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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