2000 CADILLAC SLS Engine And Engine Coolingcooling System Problems

GOOD MORNING;I HAD PURCHASED A 2000 CADILLAC SEVILLE(SLS)USED AND THE CAR SHUT OFF AS I WAS DRIVING ON A MAJOR HIGHWAY. THE INSTRUMENT PANEL (DIGITAL)STARTED FLASHING ENGINE IS HOT,VEHICLE ENGINE MUST BE SHUT DOWN. THE CAR STARTED LOOSING POWER AND I WAS ABLE TO STEER OFF TO THE SIDE OF ROAD. I'M NOT SURE IF THE ENGINE WOULD HAVE OVERHEATED AND CAUGHT FIRE OR NOT? I RETURNED THIS VEHICLE TO USED CAR DEALER FOR REFUND. I WAS TOLD TO TAKE IT TO A GARAGE AND I DISCOVERED THE RADIATOR CAP WAS LEAKING. IT WAS REPLACED. TO ME IT LOOKED LIKE IT WAS WARPED? ALSO I WAS TOLD THE FUEL SENDING SENSOR WAS DEFECTED AD GAS TANK WOULD HAVE TO BE REMOVED,SO I RETURNED THE VEHICLE TO DEALER. HE ACCEPTED TO TAKE CAR BACK.HE TOOK ME TO SEE A 1999 CADILLAC SEVILLE(SLS) AND WE DISCOVERED THIS CAR HAD THE PROBLEM OF...