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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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