[rattlsnak]

the only A/C service bulletins on a 98 ZJ are these:

24-003-03 A/C System Additives
24-009-02 A/C System Leak Detection
24-02-98 HEATER A/C HOUSING SERVICE
24-11-97 A/C EVAPORATOR ODOR

None of those address your concern. The only repair has been stated above in other posts. Something still has to be in the drain tube, or something higher up in the evap case not letting water get to the drain.