I would pull off/out the Blower Fan motor in engine bay and reach in and feel the Evaporator fins, see if there is any debris blocking part of it
You can also start the engine and run the AC, then feel if the whole Evaporator is cooling down, "icy cold"
1994 uses a slider switch with cable to operate the Blend Door, the TEMP control slider
The Blend Door routes the air from the blower/fan either thru the Heater core(HOT), or around the Heater core(COLD), or anywhere in between
AC can only go down to 35degF, or it can freeze internally and stop working, so it generally stays at about 38-40degF
Heater core is at 190degF
So any leakage at the Blend door would heat up the air coming out of the vents pretty quick, lol
Easy to check this
Warmed up engine, Turn AC off
Slide blend door control to COLD
Fan on HIGH
Should be outside air temp coming thru the vents
Slide control to HOT
Should get hot air coming out
Slide it back to COLD
Should cool off right away
There is an adjustment for TEMP slider, its above glove box
Fold down glove box all the way, pinch the sides
Look on top of the "air box" you will see the cable
Move the slider and you can see it moving the Blend Door arm
There is a screw that holds the cable's sheath, thats the adjustment