How do you change heater core in 2002 Mitsubishi Montero?

To change the heater core in a 2002 Mitsubishi Montero, first, disconnect the battery and drain the coolant. Remove the dashboard and related components to access the heater core housing, then disconnect the heater core hoses and remove the old unit. Install the new heater core, reattach the hoses, and reassemble the dashboard before refilling the coolant and reconnecting the battery. Always refer to a repair manual for specific instructions and safety precautions.