That or the evaporator or a connection in there.

KWitcher, it's a hard place to diagnose where the leak is because you can't really get in there without removing stuff. You could try dye then remove covers and use UV light to possibly see dye leakage.

If it's a 95 and never serviced it probably could use expansion valve and o-rings. Since it has leaked out you could also use compressed air and soap solution to look for bubbles. After fix you'll need to pull a vacuum for at least an hour.

92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles