Heater core

Its under the dash- passenger side. The entire dash has to come out to change it

REMOVAL AND INSTALLATION
1. Perform steps 1 through 7 of Blower Motor removal and installation. See: Blower Motor > Procedures
2. Remove relay panel above glove compartment opening.
3. Through glove compartment opening, disconnect the A/C vacuum line connector and radio noise capacitor connectors.
4. Remove left windshield pillar trim cover.
5. Remove left lower side cowl trim cover.
6. Remove hood release handle mechanism attaching screws.
7. Remove steering column trim covers.
8. Disconnect parking brake release mechanism connecting rod. Gain access through fuse panel opening.
9. Remove lower left instrument panel silencer.
10. Remove lower left instrument panel reinforcement.
11. Remove instrument panel center (radio) bezel.
12. Remove forward floor console.
13. Remove the radio.
14. Remove the heater A/C control.
15. Remove cigar lighter.
16. Remove message center/trip computer, if equipped.
17. Disconnect side window demister tubes from top of heat A/C unit.
18. Remove steering column upper attaching bolts and allow the steering wheel to rest on the driver seat cushion.
19. Remove upper instrument panel (defroster outlet) cover.
20. Remove upper instrument panel attaching screws from below the windshield opening.
21. Loosen (do not remove) the left lower cowl instrument panel attaching screw.
22. Remove the right lower cowl instrument panel attaching screw.

CAUTION: Protect the passenger seat cover from soiling or damage using a suitable cover.

23. Carefully pull the instrument panel away from the dash panel on the right side of the vehicle and allow the instrument panel to rest on the passenger seat cushion.

CAUTION: Before proceeding with operation review the safety precautions.

24. From the engine compartment, drain the cooling system and disconnect the heater hoses from the heater core nipples, plug the nipples to avoid spilling coolant inside the vehicle.
25. Completely discharge the refrigerant system.
26. Disconnect the refrigerant lines from the H-valve at the dash panel on the right side of the vehicle. Seal the refrigerant lines using plastic sheeting and tape.
27. Remove the H-valve from the evaporator plate. Wrap the H-valve in plastic sheeting and tape to avoid contamination.
28. Remove the condensate drain tube.
29. Remove heater A/C unit to dash panel attaching nuts.
30. From inside the vehicle, pull rearward on the heater A/C unit to clear the dash panel silencer and remove the unit from the vehicle.

To install, reverse the preceeding operation. Refill cooling system and test for leaks. Evacuate and charge the refrigerant system and test overall performance.

REMOVAL AND INSTALLATION

NOTE: The evaporator case (Heater-A/C housing) must be removed from the vehicle first. See: Evaporator Case Service and Repair

Remove heater A/C unit top cover.
Remove heater core to dash panel seal from the core tubes and remove the heater core from the unit.
To install, reverse the preceding operation.

DISASSEMBLE

Heater A/C Unit

Place the heater-A/C unit on a suitable work surface.
Locate and remove one, 1/4-20 retaining nut from the blend-air door pivot shaft.
Blend Air Door Crank Linkage
Using a common pair of pliers, place one plier jaw on top of pivot shaft and the other jaw under the crank arm linkage and pinch the crank arm off of the pivot shaft.
Disconnect the vacuum lines from the defrost and panel mode vacuum actuators and position them out of the way.
Remove three heater-A/C unit cover attaching screws going upward at the defroster outlet chamber.
Remove two heater-A/C unit cover attaching screws going upward at the air inlet plenum.
Heater A/C Unit Cover
Remove eleven heater-A/C unit cover attaching screws going downward into the housing and lift the cover from the heater A/C unit.
To reassemble, lower the heater-A/C unit cover into place. Then guide the panel air mode door pivot shaft into its socket and reverse the preceding operation.

It's in the heater box behind the dash board. To remove it you have to drop the steering column and pull the dash board back, discharge the air conditioning system and disconnect the lines. Replacing it is not exactly a do-it-yourselfer project. If you have any thoughts on trying to do this yourself, don't even start until you have a copy of the manufacturer's service manual to follow. All the steps will be listed with line drawings.

It will be located under the dash all the way to the firewall under the dash near the center and behind the air box. You can find its general locations also by finding the coolant lines that run from the engine to the firewal inside the engine bay. These lines are the inlet and outlert for the heater core and will run to the inlet and outlet of the heater core at the firewall. You will also see a rataing nut or two near the hoses at the firewall. These hold the heater core in place againt the insed of the firewall under dash and must be removed to pull the heater core out. The entire airbox must be removed to access the haeter core under the dash.