REVISED BACK WINDOW ASSEMBLY (NEW PART)

VEHICLES AFFECTED: 1986-89 H CARS

A revised back window glass assembly, part number 20748587 (tinted) or 20748588 (tinted and rear window defogger), for the 1989 H car, went into production at Buick City on Wednesday, May 17, 1989, VIN 1G4HP14C6KH518140.

The new glass assembly includes a more aggressive design proving a better fit to the body sheet metal on the sides and top edge of glass. A new 30.Omm lower lip, along the bottom edge of the glass, eliminates the lower reveal moulding.

The old glass assembly, part numbers 20745202 or 20745204, have been deleted from service because it will not work as a replacement part for current production. The welded on mounting stools for the back window lower reveal moulding have been eliminated. Replacement on H car vehicles built prior to VIN 1G4HP14C6KH518140 will also use the new glass assembly (20748587 or 20748588). This can be done by removing the hat section stools used for mounting the lower reveal moulding.

Perform the following glass replacement procedures:

1. Remove back window assembly as described in the Body Service Manual, Section 3-2.

2. Cut back window lower reveal moulding stools.

3. Flatten sides of stools flush to body.

4. Apply body seam sealer or equivalent to stools to prevent corrosion.

5. Install new glass to vehicle and water test.

Use most applicable Labour Operation and Time from the Canadian Labour Time Guide.

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.