Need to replace heating core

Why not just read the FSM (factory service manual)
in the HVAC chapter,.
click WK here
then its special, the whole manual in pdf downloads
then click HVAC.

http://www.morris4x4center.com/knowledge-base/index.htm?utm_source=cj#service

best deal on a jeep like this there is, and 100% free and real.
real OEM book, clean.

posted over 300 times.

1. Disconnect and remove the negative battery.
   CAUTION After disconnecting the negative battery cable, wait 2 minutes for the driver-s/passenger-s air bag system capacitor to discharge before attempting to do any work around the steering column or instrument.
   
2. Drain the cooling system into a clean container for reuse.
3. Remove the instrument panel by performing the following procedure:
   1. Turn the steering wheel in the straight-ahead position.
   2. Remove the knee blocker from the instrument panel.
   3. Remove the steering column; do not remove the air bag module, the steering wheel or switches from the steering column.
   4. From under the driver-s side of the instrument panel, disconnect the following items:
      
      Instrument panel wiring harness connector from the 100-way wiring harness connector at the left side of the inner panel. Side window demister hose at the heater/air conditioning housing demister/defroster duct on the driver-s side.
      
   5. Remove the glove box.
   6. Reaching through the glove box opening, disconnect the following items:
      
      Two halves of the heater/air conditioning system vacuum harness connector. Instrument panel wiring harness connector from the heater/air conditioning system wiring harness connector. Instrument panel wiring harness connector from the passenger-s side air bag module wiring harness connector. Side window demister hose at the heater/air conditioning housing demister/defroster duct (passenger-s side). Two halves of the radio antenna coaxial cable connector. Two instrument panel wiring harness connectors from the passenger air bag ON/OFF switch wiring harness connector. Passenger-s side air bag ON/OFF switch wiring harness from the retainer clip on the plenum bracket that supports the heater/air conditioning housing just inboard of the fuse block module. Two lower passenger-s side air bag module bracket-to-dash panel nuts.
   7. Remove the upper cover from the instrument panel.
   8. Remove the 3 instrument panel-to-door hinge pillar screws.
   9. Remove the 4 upper instrument panel-to-dash nuts.
   10. Using an assistant, remove the instrument panel from the vehicle.


4. If equipped with air conditioning, discharge and recover the air conditioning system refrigerant.
5. Disconnect the refrigerant lines from the evaporator. Plug the refrigerant openings to prevent evaporation.
6. Disconnect the heater hoses from the heater core tubes.
7. Disconnect the heater/air conditioning system vacuum supply line connector from the T-fitting near the heater core tubes.
8. In the engine compartment, remove the 5 heater/air conditioning housing-to-chassis nuts. If necessary, loosen the battery hold-downs and reposition the battery for access.
9. Remove the cowl plenum drain tube from the heater/air conditioning housing stud; it-s located behind the cylinder head on the cowl.
10. From the bottom of the heater/air conditioning housing, remove the floor duct.
11. On the passenger side, remove the heater/air conditioning housing-to-plenum bracket screw.
12. Pull the heater/air conditioning housing down far enough to clear the defrost/demist and fresh air ducts, then, rearward far enough to clear the mounting studs and the evaporator drain tube to clear the dash panel holes.
13. Remove the heater/air conditioning housing assembly from the vehicle.
14. Remove the heater/air conditioning housing upper case.
15. Lift the heater core from the lower half of the heater/air conditioning housing.