The contact owns a 2014 Chevrolet Sonic. The contact stated that while driving at various speeds, the A/C failed to function as intended. The contact stated that there was hot air blowing from the vents at all time. In addition, the contact stated there was an abnormal sound coming from the engine, with an abnormal fuel burning odor on the interior and exterior of the vehicle. No warning lights were illuminated. The vehicle was taken to an independent mechanic; however, no cause for the failure was found. The vehicle was not repaired. The manufacturer was not notified of the failure. The contact related the failure to NHTSA Campaign Number: 14V417000 (EQUIPMENT). The failure mileage was unknown. The VIN was not available.