Heater Core: Service and Repair
1. Allow engine to cool and release pressure from system, then disconnect heater hoses from heater core tubes, and plug hoses.
2. Working in passenger compartment, remove glove compartment assembly.
3. Remove seven screws attaching the heater core access cover to plenum chamber.
4. Disconnect vacuum lines, then remove the cover with the vacuum harness attached.
Fig. 20 Disassembled view of heater case:
5. Remove heater core from vehicle, Fig. 20.
6. Reverse procedure to install.