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check the actuator motor on the heater sounds like the motor is not directing the air as it should. The motor is in the center of the truck inside attached to the heater and has arms on it to move the heater and ac doors.
Depending on what system is in that truck you may have a bad blend door motor or a vacuum leak, check around the engine for ant vacuum leaks or dissconnected lines, if its controled by selector motor then motor may be bad, this motor move the door to contorl which way the air comes out ,like defrost or vent or floor, the actuator motor is located under the dash bolted to heaterbox, this may be hard for you to find as there are 3 ,actuator motors, they control the recirculation door then one for temp and last the selector actuator. the best way to locate bad is to locate one at a time and watch as you move all heat controls until you find the one that doesnt move, that will be the bad one. hope this helps.
This may be caused by two things depending on the type of system, you may have a vaccum leak to the controls from the engine, like a broken vacuum line or your selector motor is bad, this motor moves a door in the heater/ac box that controls the flow of air to defrost vents or floor.i would say a 2004 jeep would mostlikely use the actuator motor instead of vacuum, have the selector motro checked.
Chanses are its either the blend door motor quit working or the controls ( temp., selector, blower) in dash are bad, my 95 did the same thing i chg. the blend door motor thinking it was that, but it turned out to be the controls in the dash, 5 minutes work and 140.00 later it was fixed.
I have a 1500 chevy picup that did the same thing the control panel (blower, temp, and selector) is what was the problem with mine replaced that and fixed it. Very easy to chg.front of dash pops off control panel pops out 1 plug ( yours may have 2 plugs)
pop back in and your done.
there should be a little canaster insid the dash maybe attach to the duct work it changes the position of the door if not it may be the control slide that you move to change the position of the heats function