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You have a sticking valve or the problem is in the heater control. I have a 1998, and the temp control knob has to be turned back and forth in order to change from hot to cold. I don't know if the knob goes to a cable or if it has an electrical sensor. ==another possibility== You may just have a stuck or bad thermostat. This has happened to me on several cars ovedr the years and 9 times out of 10 the thermostat was bad. This can happen as normal wear and tear over time or because of a faulty cooling system. If the temperature gauge runs hot sometimes this could very well be the case.

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Q: Why would the heat not work for a while in a 1999 Ford F150 then work when you were off road then not work again after the truck was stopped?
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