SOME VEHICLES MAY EXHIBIT A RATTLE/CHATTER TYPE NOISE FROM THE A/C VENTS WHEN DRIVING ON AN UNEVEN/ROUGH ROAD SURFACE .THE CHATTERING NOISE MAY BE CAUSED BY THE VENTILATOR GRILLE SLIPPING OUT OF POSITION AND THE OUTER EDGE CONTACTS THE DASHBOARD. THIS CONCERN MAY OCCUR WITH ANY VENTILATOR GRILLE(S). TO PREVENT THE VENTILATOR GRILLE FROM SLIPPING OUT, THE SHAPE OF THE DASHBOARD HAS BEEN CHANGED.