TL* THE CONTACT OWNS A 2007 TOYOTA AVALON. THE CONTACT STATED A WHITE POWDER RESIDUE EMITTED THROUGHOUT THE AIR VENTS UPON ACTIVATING THE DEFROSTER. THE VEHICLE WAS CURRENTLY BEING REPAIRED. THE CONTACT EXPERIENCED RESPIRATORY PROBLEMS DUE TO THE DEFECT. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE CONTACT EXPRESSED CONCERN OF THE HEALTH RELATED ISSUE. THE APPROXIMATE FAILURE MILEAGE WAS 31,000.