If it spent any time in the rust belt, look thoroghly and use a sounding hammer to find rusted chassis areas. If moderate to severe rust present, walk away.
1993 may or may not have the required AC coolant type. The obsolete R12 systems are literally unserviceable, so hopefully it is the newer R134a system which is marked on an info label. If the old R12, enjoy it while it lasts.