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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