THE FIRST FORD DEALERSHIP COULD NOT FIND THE PROBLEM..checked rubber around rear door and said nothing found. the vibration-noise still there and frustrated! the 2nd Ford Dealership ( SILVERLAKES Mc Carthy Pretoria) find that a plastic cover underneath the left rear part of the car ( that cover or protects the onderstel of the vehicle) was loose and when the vehicle reaches a high speed it vibrates against the body of the car and sounded as if it is the door)
they fasten the cover and ....the car drives like a dream, no irritating sound except for the general road/wind noise of the Ford.