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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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