The contact owns a 2013 Kia Optima. The contact stated that the engine was replaced four years ago. The contact stated that the engine had not been running correctly since the engine was replaced. The contact stated that the engine was overheating, and there were several unknown warning lights illuminated. The contact stated that most recently the head gasket failed. The contact had taken the vehicle to a local dealer; however, the dealer was unable to diagnose the vehicle. The vehicle was not repaired. The contact stated that the vehicle had been taken to the same dealer several times. The contact stated that the dealer had the vehicle towed back to the residence and declined perform any further repairs. The manufacturer was informed of the failure. The failure mileage was 133,997.