Heater Core: Service and Repair

1982---85 RIVIERA
1. Disconnect battery ground cable and drain cooling system.
2. Disconnect heater hoses from heater core and install plugs in heater core outlets.
3. Remove instrument panel sound absorbers, then lower steering column.
4. Remove instrument cluster as described under Instrument Cluster, Replace.
5. Remove radio front speakers.
6. Remove screws attaching manifold to heater case.
7. Remove upper and lower instrument panel attaching screws.
8. Disconnect parking brake release cable.
9. Disconnect instrument panel wiring harness from dash wiring harness.
10. Disconnect righthand remote control mirror cable from instrument panel pad.
11. Disconnect speedometer cable and temperate control cable at heater case.
12. Disconnect radio, A/C wiring and vacuum lines, and all wiring necessary to remove instrument panel assembly. If equipped with pulse wiper, remove wiper switch, unlock wire connector from cluster carrier and separate pulse wiper jumper harness from wiper switch wire connector.
13. Remove instrument panel and harness assembly.
14. Remove defroster ducts, then remove blower motor resistor.

Fig. 12 Heater housing installation. 1982---85 Riviera:

15. Remove A/C-heater housing to dash panel nuts, Fig. 12.
16. Remove housing to dash screw and clip from inside vehicle, then remove housing assembly from dash.
17. Remove heater core from housing assembly.