How change a heater core in 1999 Dodge Dakota?

To change the heater core in a 1999 Dodge Dakota, first, disconnect the battery and drain the cooling system. Remove the dashboard and the heater box cover to access the heater core; this typically involves removing several screws and clips. Disconnect the hoses attached to the heater core, remove it from the housing, and replace it with the new core. Finally, reassemble the heater box, dashboard, refill the cooling system, and reconnect the battery.