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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
... [Read Article]
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