Heater - A/C Housing Removal and Installation

REMOVAL
The heater core may be removed without removing the unit housing. Refer to: "Heater Core : Service and Repair" Service and Repair.
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1. Disconnect battery negative remote cable. This must be done to prevent accidental air bag deployment.

WARNING:
- AVOID BREATHING A/C REFRIGERANT AND LUBRICANT VAPOR OR MIST. EXPOSURE MAY IRRITATE EYES, NOSE AND THROAT. USE ONLY APPROVED SERVICE EQUIPMENT MEETING SAE REQUIREMENTS TO DISCHARGE R-134a SYSTEM. IF ACCIDENTAL SYSTEM DISCHARGE OCCURS, VENTILATE WORK AREA BEFORE RESUMING SERVICE.

- R-134a SERVICE EQUIPMENT OR VEHICLE A/C SYSTEM SHOULD NOT BE PRESSURE TESTED OR LEAK TESTED WITH COMPRESSED AIR. SOME MIXTURES OF AIR/R-134a HAVE BEEN SHOWN TO BE COMBUSTIBLE AT ELEVATED PRESSURES. THESE MIXTURES ARE POTENTIALLY DANGEROUS AND MAY RESULT IN FIRE OR EXPLOSION CAUSING INJURY OR PROPERTY DAMAGE.

2. Using an A/C recovery unit, remove all R-134a refrigerant from the A/C system.
3. Remove air cleaner hose and air distribution duct from the engine.
4. Drain the engine cooling system. Refer to: "Engine, Cooling and Exhaust : Cooling System : Service and Repair" Service and Repair
5. Disconnect heater hoses at the dash panel. Plug the heater core inlet and outlet tubes to prevent antifreeze from spilling on the vehicle interior during removal. If an appropriate plug cannot be found pull back carpet and use caution when removing unit. Keep the heater tubes elevated to prevent spillage of coolant.
6. Remove both A/C lines from expansion valve. Use Special Tool Kit 7193 to disconnect quick connectors on A/C lines. Refer to A/C line removal for complete procedure. After removing lines cap the expansion valve openings and the A/C hose openings. This will prevent any dirt or moisture from entering the refrigerant system during servicing.

CAUTION: The lubricant used in this air conditioning system absorbs moisture readily (similar to brake fluid). Do not leave any portion of the system open for extended periods of time.

Trim Bezel:

7. Remove trim bezel.

Control Module Screws:

8. Remove cluster hood bezel retaining screws in the trim bezel opening.
9. Pry up the cluster hood bezel a few inches to expose the cubby bin/cigar lighter bezel screws.
10. Remove the cubby bin/cigar lighter bezel and wiring.
11. Remove the control module retaining screws.

Control Module At Bezel Opening:

12. Drop the A/C control module into the cigar lighter/cubby bin bezel opening. Then disconnect the wiring on the rear of the control module.
13. Release the cable clips from the top of the control module. Retain the clips for future use. Then disconnect the temperature control and recirculation control cables.
14. Remove the control module.
15. Remove upper instrument panel bezel. Refer to: "Instrument Panel, Gauges and Warning Indicators : Instrument Panel : Service and Repair" Service and Repair
16. Remove right and left instrument panel end caps.
17. Remove left lower knee bolster. Disconnect mode door motor wiring.
18. Remove right and left interior door post kick panel.
19. Remove front and rear halves of floor console.
20. Remove the radio.
21. Remove right side lower silencer/duct.
22. Remove glove box assembly
23. Remove right side vertical support strut brace.
24. Remove left side vertical support strut brace.
25. Remove center lower distribution housing.
26. Remove bolts securing Heater-A/C housing to metal I/P frame.
27. Remove upper instrument panel cowl trim cover.
28. Disconnect steering column from instrument panel. Lower steering column.
29. Remove instrument panel bolts at cowl fence.
30. Remove bolts at lower A-posts.
31. Remove instrument panel frame and wiring.
32. Remove bolts securing Heater-A/C housing to cowl.

INSTALLATION
For installation, reverse the above procedure. Verify that the cables are properly adjusted, free of interference, and the control module is seated properly.

CABLE ADJUSTMENT
The cables must be adjusted for proper function of the control module. To adjust the cable, attach the cable to the lever arm of the control module. Turn the knob fully counterclockwise. Pull the cable jacket away from the cable end until taut. Clip the cable jacket to the control module. The knob should travel a full 180° if the cable is properly adjusted.