The contact owns a 2019 Ford Ranger. The contact stated that the temperature failed to adjust as needed. The contact stated that the damper was stuck. The heater was continuously blowing out hot air on the driver’s side. There were no warning lights illuminated. The contact stated that the failure was related to NHTSA Campaign Number: 19V726000 (Visibility). The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted, and opened a case, and referred the contact to the NHTSA Hotline. The failure mileage was approximately 25,152.