The contact owns a 2016 Ford F-150. The contact stated that while driving at an undisclosed speed, the contact became aware that the HVAC system was not functioning properly. Due to the failure, the contact was unable to activate the front windshield defroster. No warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the blend door actuator. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 19V726000 (Visibility), but the VIN was not included. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was 120,000.