Yes, your core is leaking. The core is in the box under the dash. The procedure is quite involved. I will attempt to paste from autozone.com below:
- Before servicing the vehicle, please familiarize yourself with safety procedures.
- Disconnect and remove the negative battery.
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.
- Drain the cooling system into a clean container for reuse.
- Remove the instrument panel by performing the following procedure:
- Turn the steering wheel in the straight-ahead position.
- Remove the A-pillar trim from both sides of the vehicle.
- Remove the top cover from the instrument panel.
- Near the windshield line, remove the 4 instrument panel-to-chassis nuts.
- Remove the scuff plates from both front door sills.
- Remove the trim panels from both sides of the inner cowl.
- Remove the floor console.
- Remove the fuse cover from the junction box.
- Remove the instrument panel cluster bezel.
- Remove the steering column opening cover from the instrument panel.
- Remove the steering column bracket from the instrument panel column support bracket.
- Remove the lower steering column shroud cover-to-multifunction switch screw; then, unsnap both halves of the shroud cover from the steering column.
- Disconnect the instrument panel wiring harness connectors from the following steering column components:
Both lower clock spring connector receptacles
Left multifunction switch receptacle
Right multifunction switch receptacle
Both ignition switch receptacles
Shifter interlock solenoid receptacle
Sentry Key Immobilizer Module (SKIM) receptacle, if equipped
- Turn the ignition switch to ON position; then, release and remove the shifter interlock cable connector from the ignition lock housing receptacle.
- Turn the ignition switch to OFF position; this will prevent the steering wheel from turning and the loss of the clock spring centering following steering column removal.
- Remove the 4 steering column-to-instrument panel steering column bracket nuts.
- Remove the steering column from the instrument panel.
- Disconnect both side body wiring harness bulkhead connectors, the Ignition Off Draw (IOD) wiring harness connector and the fused wiring harness connector from the junction block connector receptacles.
- Disconnect the instrument panel wiring harness-to-floor console component connectors:
Air bag control module connector receptacle
Parking brake switch terminal
Transmission shifter connector receptacle
- Remove the 2 instrument panel wiring harness-to-floor console ground terminals located behind the air bag control module.
- Disconnect the instrument panel wiring harness-to-floor console retainers.
- Remove the instrument panel-to-floor console bracket screws and the bracket.
- Remove the driver-s side floor duct-to-heater/air conditioning housing assembly screw and remove the duct.
- If equipped with a manual heating-air conditioning system, disconnect the vacuum harness connector from behind the driver-s side floor duct.
- Remove the instrument panel steering column support bracket-to-driver-s side of the heater/air conditioning housing assembly screw
- Remove the instrument panel steering column support bracket-to-intermediate bracket screw.
- Remove the instrument panel steering column support bracket-to-driver-s side cowl plenum panel nut.
- Remove the 2 instrument panel-to-driver-s side cowl side inner panel screws.
- Remove the instrument panel end cap.
- Remove the lower right center bezel from the instrument panel.
- At the passenger-s side cowl side inner panel, disconnect the instrument panel wiring harness bulkhead connector from the lower cavity of the inline connector.
- Near the right side cowl inner panel, located under the end of the instrument panel, disconnect both halves of the radio antenna coaxial cable connector.
- Disconnect the 2 instrument panel-to-heater/air conditioning assembly wiring harness connectors.
- At the passenger-s side, remove the 2 instrument panel structural duct-to-heater/air conditioning housing assembly screws.
- At the passenger-s side cowl side inner panel, remove the 2 instrument panel-to-passenger-s side cowl side inner panel screws.
- With the help of an assistant, lift the instrument panel from the vehicle.
- Discharge and recover the air conditioning system refrigerant.
- Disconnect the air conditioning system lines at the evaporator. Plug the openings to prevent contamination.
- Disconnect the heater hoses from the heater core. Plug the openings to prevent coolant loss.
- If equipped with a manual temperature control system, unplug the heater/air conditioning system vacuum supply line connector from the T-fitting located near the heater core tubes.
- From the passenger-s side inner fender shield, remove the coolant reservoir/overflow bottle.
- From the passenger-s side in the engine compartment dash panel, remove the PCM; DO NOT unplug it, just move it aside.
- In the engine compartment, remove the heater/air conditioning housing-to-chassis nuts.
- At the center of the dashboard, remove the rear floor ducts from the floor heat duct outlets.
- Disconnect the heater/air conditioning housing wire harness connectors.
- In the passenger compartment, remove the heater/air conditioning housing-to-chassis nuts.
- Place covers inside the vehicle to catch any spilt coolant.
- Remove the heater/air conditioning housing assembly from the vehicle.
- Remove the foam gasket from around the heater core tubes.
Note the position of the irregular shaped gasket so that it may be reinstalled in its correct position.
- Remove the heater core retainers and screws.
- If necessary, remove the mode door actuator for clearance to remove the core.
- Remove the heater core from the heater/air conditioning housing assembly.
Fig. View of the instrument panel assembly-Grand Cherokee