Tl* the contact owns a 2019 gmc yukon. the contact stated that while operating the vehicle the front seat driver and passenger had become ill and suffered dizziness and light headiness and the passenger also suffer breathing problems which required medical treatment. the vehicle was taken to the local dealer rivertown buick/gmc (1661 whittlesey rd. columbus ga) who was unable to determine the cause of the failure but would replaced the evaporator coil. the manufacturer was not notified of the failure. the failure mileage was 2,000.