I purchased my car used. How do I know if the recall problems have been checked

Call your local dealership or Buick North Americas customer service have the VIN number ready and they will tell you if all recalls have been done. Buick's Customer Relations Center (for Buick owners): 1-800-521-7300 Monday-Saturday - 8 a.m. - 9 p.m. (EST) Sunday - Closed

As for the noise when turning right, have the CV Joints inspected. The CV (constant velocity) joints are the joints at the end of the drive axle where it connects to the wheel hub.