How do you replace heater core 2003 Kia Sorento?

To replace the heater core in a 2003 Kia Sorento, start by disconnecting the negative battery cable and draining the coolant from the radiator. Remove the dashboard and center console to access the heater core, then disconnect the hoses connected to it. Replace the old heater core with the new one, reconnect the hoses, and reassemble the dashboard. Finally, refill the cooling system with coolant and check for leaks before reconnecting the battery.