During high in-vehicle temperatures, the rear headliner roof molding on the subject models may warp or sag.
If this condition occurs, a new molding, p/n 15554978, has been released for service. this new molding has four additional screws retaining the molding to the roof inner panel.
To install, place the new molding into position and attach at each end using existing holes (See Figure 1). Drill four 1/8" holes into the roof inner panel that correspond to the holes in the new molding (not shown). Attach using screws, P/N 11504659.
Beginning with the following VIN breakpoints, the new molding was incorporated into production.
Chevrolet HF187901 GMC HF527088
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.