Heater Core: Service and Repair

Heater Core

Fig. 6 Exploded view of heater system. 1984:

1. Disconnect battery ground cable.
2. Drain coolant.
3. Disconnect inlet and outlet hoses from heater unit, Fig. 6.
4. Remove heater hose grommet from inside firewall.
5. Remove radio housing or console retaining screws and unit with which model is equipped.
6. Remove instrument panel and package tray.
7. Remove large duct between blower assembly and heater unit.
8. Remove left and right defroster nozzles.
9. Remove upper heater unit retaining bolts.
10. Lift heater unit up approximately 0.39" and remove from installed position.
11. Remove heater core fitting assembly cover.
12. Disconnect rod from plastic clamp.
13. Remove inlet and outlet hose clamps. Twist cotter pin counterclockwise to remove outlet hose clamp.
14. To remove heater core fitting assembly, remove retaining screws and pull assembly up and forward.
15. Disconnect defroster flap control rod.
16. Remove heater case retaining clips and separate the halves.
17. Remove heater core.
18. Reverse procedure to install.