I PURCHASED A BRAND NEW 2007 GMC ACADIA IN NOV. OF 2007. SINCE NEW IT HAS HAD A STEERING ISSUE THAT CAN NOT BE FIXED. THE RACK AND PINION HAS BEEN REPLACED AND THE VEHICLE HAS BURNED UP NUMEROUS POWERSTEERING PUMPS. THE STEERING, WHILE IN A CURVE, WILL LOCK UP AND THEN RELEASE THROWING THE VEHICLE IN THE DIRECTION THE WHEEL IS TURNED. IT HAS THROWN THE VEHICLE INTO THE OTHER LANE OF ON COMING TRAFFIC AS WELL AS THROWING THE VEHICLE OF THE ROAD INTO A FENCE. EACH TIME THE DEALERSHIP HAS PICKED THE VEHICLE UP REPLACED THE STEERING PUMPS BUT THE PROBLEM STILL REMAINS. THE VEHICLE CURRENTLY HAS 47,000 MILES ON IT. THE TRANSMISSION LOCKED UP AND THE SHIFTING COMPONENTS WERE REPLACED, THEN THE TRANSMISSION LOCKED UP AND WAS REPLACED. THE STEERING ISSUE IS ARE MAIN CONCERN. IT WAS TAKEN IN ON 9/28/10 AND RECEIVED NEW TRANSMISSION AND POWERSTEERING PUMP. WE RECEIVED THE VEHICLE ON 10/25/2010. ON, 10/28/10 THE VEHICLE STEERING LOCKED UP AGAIN THROWING MY WIFE OFF THE ROAD INTO A FENCE. THERE IS NO WAY THAT GM HAS PUT THREE BAD POWER STEERING PUMPS ON THE VEHICLE. THE VEHICLE HAS A MORE SERIOUS PROBLEM THAT IS BINDING THE STEERING CAUSING THE PUMPS TO BURN UP. THE SAME PROBLEM HAS MADE THE VEHICLE UNSAFE TO DRIVE DUE TO THE DANGER OF IT LOCKING UP AND THROWING THE VEHICLE INTO ON COMING TRAFFIC. I HAVE ALL SERVICE RECORDS REPORTING THIS ISSUE. I WILL NOT ALLOW MY BACK IN THIS VEHICLE AND I AM NOT COMFORTABLE TRADING IT IN FOR ANOTHER FAMILY TO BE KILLED IN IT. I COULD NOT LIVE WITH THA