The HVAC temp control on that truck is cable operated. If you twist the temp knob quickly from hot to cold you should be able to hear the door thump when it stops both ways, this tells you if it's moving all the way and sealing shut on the case.
Another thing if the above seems ok is the heater core being clogged. With engine warm, pop hood and feel both heaters hoses, both should be hot, the return hose might be slightly cooler but make sure its not cold. I assume you verified the engine is reaching operating temp.
I'm pretty sure they went from cable to electronic temp blend door actuators in '99, my 98 is still cable. The rest of the functions are vacuum, fed from a vacuum pump on engine.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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