To repair a leaking Vista Vent which may be caused by the surround weatherstrip, a new solid core weatherstrip is available, Part number 20534581 for Skyhawk vehicles and part number 20534580 for Century and Skylark vehicles.
This new weatherstrip went into production during April, 1984.
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.