NOTE : Vehicles may be equipped with an aluminum or a copper brass heater core. In all cases, replacement cores are copper brass. It is essential to positively identify the type of core being replaced because aluminum cores use different heater core-to-heater case seals (Fig.19) than the copper brass cores. Having the correct seal is essential for satisfactory performance of the heater system.
Identificationn can be made by looking at one of the core tubes after a hose has been removed. An aluminum core will have a colored tube. A copper brass core will have a brass-colored tube.
If the vehicle has a copper brass core, the seal removed with the old core can be used with the new copper brass replacement core, providing it is not damaged during removal.
If the vehicle has an aluminum heater core, a new seal for the copper brass replacement core will be required.
Drain coolant from radiator.
Disconnect the heater hoses from the heater core.
Working inside vehicle, remove two screws retaining floor duct to plenum. Remove two screws retaining floor duct to instrument panel (Fig.19). Remove floor duct.
Remove four screws attaching heater core cover to heater case (Fig.19).
Remove heater core cover and heater core from plenum.
Position heater core and cover to heater case. Clip heater core tubes through dash panel seal holes.
Support heater core and cover in place. Install four attaching screws. Install heater hoses to core.
Position floor duct to heater case and instrument panel. Install four attaching screws.
Connect heater hoses to heater core. Tighten hose clamps only to specification.
Fill radiator with the correct coolant mixture to specified level.
Check for proper system operation.