BOOMING NOISE WITH HATCH ROOF REMOVED

VEHICLES AFFECTED: ALL VEHICLES EQUIPPED WITH AN AD3 REMOVABLE OR CF5 SLIDING SUNROOF SOME VEHICLES EQUIPPED WITH A SUNROOF MAY EXPERIENCE A 'BOOMING' TYPE NOISE INSIDE THE CAR WITH SUNROOF OPEN AND THE WINDOWS ROLLED UP. THE NOISE IF DUE TO AN AIR PRESSURE DIFFERENCE CREATED BETWEEN THE OUTSIDE AIR AND THE AIR INSIDE THE CAR, WHEN THE VEHICLE IS MOVING. ON VEHICLES EQUIPPED WITH A SLIDING SUNROOF, THE NOISE MAY BE REDUCED BY SLIGHTLY OPENING ANY WINDOW, WHICH ALLOWS THE PRESSURE EQUALIZE. ON VEHICLES EQUIPPED WITH A SLIDING SUNROOF, THE NOISE MAY BE REDUCED BY EITHER SLIGHTLY OPENING ANY WINDOW OR BY SLIGHTLY CLOSING THE SUNROOF PANEL.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.