How do you replace heater core on 1979 z28 camaro?

To replace the heater core on a 1979 Z28 Camaro, start by disconnecting the negative battery cable and draining the coolant from the radiator. Remove the dashboard and the heater assembly by taking off the necessary trim and screws. Disconnect the heater hoses from the core, remove the old heater core, and install the new one in reverse order, ensuring all connections are secure. Finally, reassemble the dashboard, refill the coolant, and check for leaks.