How do you replace a 1999 yukon evaporator coil?

To replace the evaporator coil in a 1999 Yukon, first, discharge the air conditioning system to safely remove refrigerant. Then, remove the dashboard and disconnect the HVAC unit from the vehicle. After accessing the evaporator coil, unbolt it from the housing, disconnect the refrigerant lines, and replace it with the new coil. Reassemble the HVAC unit, reconnect everything, and recharge the system with refrigerant.