How do you replace heater core in a 1995 Cadillac Fleetwood?

To replace the heater core in a 1995 Cadillac Fleetwood, first, disconnect the battery and drain the coolant from the radiator. Remove the dashboard and the center console to access the heater core housing, which involves detaching various components and screws. Once exposed, disconnect the heater core's inlet and outlet hoses, remove the old core, and install the new one. Finally, reassemble everything in reverse order, refill the coolant, and check for leaks.