TL* THE CONTACT OWNS A 2008 BMW 335I. WHILE DRIVING, THE VEHICLE STARTED TO OVERHEAT. THE CONTACT NOTICED SMOKE UNDER THE HOOD WHILE THE VEHICLE WAS IDLING. UPON FURTHER INSPECTION, THE CONTACT COULD NOT DETERMINE THE LOCATION OF THE SMOKE. THE ENGINE MALFUNCTION INDICATOR ILLUMINATED. THERE WERE NO INJURIES AND A POLICE REPORT WAS NOT FILED. THERE WAS NO FIRE. THE VEHICLE WAS TOWED TO AN INDEPENDENT MECHANIC WHERE IT WAS DIAGNOSED THAT, DUE TO THE AUXILIARY COOLING FAN OVERHEATING, THE RADIATOR CRACKED AND THE AUXILIARY COOLING FAN AND RADIATOR NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBER: 17V676000 (ELECTRICAL SYSTEM). THE CONTACT CALLED MOMENTUM BMW AT (855) 645-6452 (10002 SOUTHWEST FWY, HOUSTON, TX 77074), BUT THE CALL WAS DISCONNECTED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 100,000.