Automatic Temperature Control (ATC)

Center Distribution duct asseembly:

1. Discharge A/C system and drain engine coolant. Disconnect battery ground cable.
2. Disconnect heater hoses from heater core and plug openings to prevent spillage.
3. Disconnect vacuum lines from intake manifold and water valve.
4. Remove right scuff plate and cowl side trim panel.
5. Remove glove box and A/C control panel.
6. Remove console and forward bracket if so equipped.
7. Remove screw holding forward-in-car wall of right duct and center duct together. Pivot blade of screwdriver between screw head and right duct to remove.
8. Remove 2 duct retaining screws at bottom of lower panel. Disconnect center to right duct retaining tabs by reaching through glove box opening and depressing forward surface of center distribution duct at connection to right duct.

Over Column Duct:

9. Disconnect "over column" duct and slide center duct down and back from under instrument panel.
10. Remove defroster adapter from under panel.
11. Remove drain hose and disconnect evaporator heater assembly from wiring harness.
12. Remove control cable and right side cowl to plenum brace.
13. Pull carpet back from under evaporator heater assembly.
14. Remove hanger strap from unit and remove 4 nuts on firewall that hold A/C assembly to dash panel.
15. Pull assembly back until unit studs clear dash liner. Lower unit to tunnel, then pivot assembly around lower edge of dash to remove.
16. Place evaporator heater assembly on bench and remove mode door actuator from cover.
17. Remove 2 retaining clips from front edge of cover. Remove 2 screws and remove mode door actuator from cover.
18. Remove 15 screws holding cover to assembly and remove cover. Lift mode door out.
19. Remove screw from heater core tube retaining bracket and remove core.
20. Remove H-valve seal and seal bracket screw from under H-valve sealing plate. Lift evaporator core out.
21. Reverse procedure to install.