Rear Heater Core

D-PANEL REMOVAL
1. Remove rear header trim cover.
2. Remove liftgate sill plate.
3. Remove second rear seat belt turning loop on long wheel base vehicle.
4. Remove bolt holding second rear seat belt, if equipped, anchor to quarter on short wheel base vehicle.
5. Remove quarter trim bolster on short wheel base vehicle.

Right Quarter Panel D-Pillar:

6. Remove screws holding trim panel to attaching bracket on short wheel base vehicle.

Rear Quarter D-Pillar:

7. Disengage hidden clips holding trim to D-pillar.
8. Separate D-pillar trim panel from D-pillar.
9. Disengage speaker wire connector if equipped.
10. Pass second rear seat belt, if equipped, through slot in trim panel on short wheel base vehicle.
11. Separate D-pillar trim from vehicle.

TRIM PANEL REMOVAL

CAUTION: Disconnect the negative cable clamp from battery post. Damage to accessory feed circuit can result.

1. Remove first rear seat.
2. Remove second rear seat, if equipped.
3. Remove sliding door sill trim panel.
4. Remove quarter trim bolster. Refer to: "Body and Frame : Interior Trim : Trim Panel : Service and Repair" Service and Repair
5. Remove C-pillar trim panel.
6. Remove D-pillar trim panel.
7. Remove first rear seat belt anchor.
8. Remove second rear seat belt anchor on long wheel base vehicle.
9. Remove screws holding quarter trim to quarter panel from bolster area.
10. Remove screws holding rear edge of quarter trim to attaching bracket.
11. Disengage hidden clips holding front of quarter trim to quarter panel rearward of sliding door opening.
12. Separate quarter trim from quarter panel.
13. Disengage wire connector from accessory power outlet, if equipped.
14. Pass second rear seat belt through slot in trim panel on long wheel base vehicle.
15. Pass first rear seat belt through slot in trim panel.
16. Separate quarter trim panel from vehicle.

CORE REMOVAL

Rear Heater Core:

1. Isolate and disconnect lines from heater core.
2. Remove heater core retaining screws.
3. Carefully pull the heater core and tubes up and straight out of the unit.

INSTALLATION

Filling Heater Core:

For installation, reverse the above procedures. Prefill the heater core. Test for leaks and over-all performance.

NOTE: If the heater core was emptied and was not prefilled, it is necessary to thermal cycle the vehicle TWICE. The heater core is positioned higher than the radiator fill cap. Therefore the heater core will not gravity fill to level. To thermal cycle the vehicle, it must be operated till the thermostat opens, then turned off and allowed to cool. In order to verify that the auxiliary unit is filled completely, the following procedure can be used:
- Vehicle at room temperature.
- Engine is brought up to operating temperature.
- Front unit is OFF, temperature slides are at full HEAT position.
- Engine is at idle.
- With rear blower motor ON HIGH
- Discharge air temperature, measured at the dual register located on the C-pillar base, is between 57°C to 62°C (1350 and 1450 F).