Heater Core: Service and Repair

Less Air Conditioning
1. Disconnect battery ground cable and drain cooling system.
2. Disconnect heater hoses from heater core tubes. Cap tubes to prevent leakage of coolant.
3. Remove glove compartment door, liner and lower reinforcement.
4. Move temperature control lever to WARM.
5. Remove the four screws attaching heater core cover to heater assembly, then remove the cover.
6. Working from engine compartment, loosen the two nuts attaching heater case assembly to dash panel.
7. Push heater core tubes toward the passenger compartment to loosen heater core from heater case assembly. Working from passenger compartment, pull heater core from heater case assembly and remove heater core through glove compartment opening.
8. Reverse procedure to install.

Fig. 28 Heater core removal:

With Air Conditioning
1. Drain coolant from radiator.
2. Disconnect heater hoses from heater core.
3. Working inside vehicle, remove floor duct from plenum.
4. Remove four screws attaching heater core cover to plenum, and remove heater core, Fig. 28.
5. Reverse procedure to install.