No repair is needed. The faint white vapor from the vents is condensation from a dew-point difference between inside and outside air, not smoke or a refrigerant leak. It should stop when the weather changes. A refrigerant leak would typically make breathing difficult because it displaces oxygen.
The owner of a 1991 Honda Accord noticed faint, odorless white vapor from the air-conditioning vents while the air stayed cool; it cleared after a few minutes. The expert explained it was condensation from a dew-point difference, not smoke, and said it should go away with a weather change. A freon leak was considered unlikely because that would interfere with breathing.
