Front Heater Core

DISASSEMBLY

WARNING: If equipped with air conditioning,the refrigeration system must be completely discharged before proceeding with this operation.

1. Set parking brake.
2. Disconnect negative battery cable.
3. Discharge refrigerant system.

Expansion Valve:

4. Disconnect all engine compartment lines and vacuum hoses.
5. Drain engine coolant. Plug coolant lines.
6. Remove the steering column cover.
7. Remove the left under panel silencer.
8. Remove the right under panel silencer.

Instrument Panel Assembly:

9. Remove the center bezel (clips to instrument panel).
10. Remove the accessory switch carrier.
11. Remove Heat-A/C controls.
12. Remove standard storage module.
13. Remove the right lower instrument panel.
14. Remove the right 40-way wiring bracket.
15. Remove the lower right reinforcement, body computer bracket, and mid-to-lower reinforcement as one assembly.
16. Disconnect all necessary instrument panel wiring and temporarily route wiring out of the way.
17. Disconnect the' A/C unit hanger strap from the unit and temporarily re-position.

Resistor Block And Drain Tube:

18. Remove the rubber condensate drain tube (in engine compartment).
19. Remove the four nuts (in the engine compartment) securing the unit to the dash panel.
20. Pull the entire unit rearward until the studs on the unit clear the dash panel. Drop the unit down and pull it rearward to remove it from vehicle.
21. Place heater/A/C unit assembly on workbench.
23. Remove one screw retaining the vacuum harness. Feed harness through hole in cover.

Fig. 15 Evaporator heater assembly:

24. Remove thirteen screws from top cover and remove cover. Temperature control door will come out with the cover. Remove the nut and lever from the door shaft to remove the temperature door from the cover.

Heater Core:

25. Remove screw from heater core tube retaining bracket and lift heater core out of unit.
Installation is the reverse of removal.