How do you replace a heater core on a 1998 Chevrolet aveo?

To replace the heater core on a 1998 Chevrolet Aveo, start by disconnecting the battery and draining the coolant. Remove the dashboard and the center console to access the heater core, which is located behind the firewall in the engine compartment. Detach the hoses connected to the heater core, remove any mounting screws, and extract the old core. Install the new heater core by reversing the removal process, ensuring all connections are secure and the system is properly refilled with coolant.