TAILGATE WINDOW CHIPPING CHECK FOR HEX SCREWS

VEHICLES AFFECTED: 1985-86 C/K AND 1987 R/V JIMMY/BLAZERS AMD SUBURBANS

Some 1985-86 C/K and 1987 R/V Jimmy/Blazers and Suburbans may experience a condition of chipped tailgate windows due to the use of one or more self tapping hex screws (A) in place of the specified six-lobed head tapping screw (B) shown in Figure No. 1. These screws attach the rear upper roof trim panel to the roof header.

Use of these hex head screws results in the tailgate window being trapped between the run channel seal and the screw head. Repeated use of the tailgate window wears the run channel seal in this area and allows the window to contact the screw head and chip the window.

If tailgate window chipping occurs, check for the use of hex head screws in the area mentioned. If found, replace with the specified screws, P/N 11505031. Use of hex screws was discontinued in production beginning with the following VIN breakpoints:

Chevrolet HF122052 Gmc HF512070

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.