How do you change the evaporator on a Kia Optima?

To change the evaporator on a Kia Optima, first, disconnect the battery and remove the dashboard and center console to access the HVAC unit. Next, drain the refrigerant from the air conditioning system, then detach the evaporator from the HVAC housing. Install the new evaporator, reassemble the HVAC unit, and reconnect everything before recharging the AC system with refrigerant and reconnecting the battery. Always refer to the vehicle's service manual for specific instructions and safety precautions.