How do you change a heater core on a 2000 Toyota celica gt?

To change the heater core on a 2000 Toyota Celica GT, first disconnect the negative battery terminal and drain the coolant. Remove the dashboard and the center console to access the heater core housing, followed by disconnecting the hoses and any electrical connectors. Then, unbolt the heater core from its mounting and replace it with a new one, reassembling everything in reverse order and refilling the coolant. Ensure there are no leaks before reconnecting the battery and testing the heating system.