1. Turn off the power to the air conditioning unit.
2. Locate the fan motor. It is usually located inside the air conditioning unit, near the evaporator coil.
3. Remove the fan motor from the air conditioning unit.
4. Locate the fan blade. It is attached to the fan motor shaft.
5. Remove the fan blade from the fan motor shaft.
6. Reinstall the fan blade on the fan motor shaft, facing in the opposite direction.
7. Reinstall the fan motor in the air conditioning unit.
8. Turn on the power to the air conditioning unit.
9. Test the fan motor to ensure that it is turning in the correct direction.