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: Central Illinois Strawberry Festival - by Cindy Ladage and Janna Seiz. Every year the coming of summer is highlighted by different events for different people. For some, it is heralded with the end of school, tilling the garden, or completion of the planting season. To us, connoisseurs of find food, antique tractors, farm toys, crafts, and downright fun, the annual Strawberry Festival means summer is here. Every year, in Carlinville, Illinois, the Macoupin County Historical Society and the Macoupin Agricultural Antique Association team up to fill th
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