CORROSION ON DOORS LOWER EDGE, BODY SIDE MOLDING

Models Affected: 1987-1989 BONNEVILLE MODELS

Break Point - Ending June 89 Willow Run W298394 Ending June 89 Wentzville 1209998

Some 1987 through 1989 Pontiac Bonnevilles show galvanic (surface rusting of door) corrosion on doors at lower edge of body side molding.

CONDITION

The poultice trapped between the lower edge of molding and door can become a corrosive layer due to the build up of moisture and salt, therefore providing an electrolyte bridge between stainless steel and electro-galvanize steel (door) areas. Electrical continuity through the metal fastener complete galvanic cell.

This condition may be repaired by repainting the damaged surface of door and provide an insulator between molding and door at fasteners.

REPAIR PROCEDURE:

1. Remove molding and clean up the rusted area with wire brush and apply rustoleum or equivalent on clips and T-nut area.

2. Grind off burrs, if any, at the door attachments' holes.

3. Repair damaged painted area of the doors and repaint the doors.

4. Put the insulators (part number 25556357) on T-nut of molding clips as shown on diagram. The insulator will break the continuity of the molding to door. Then attach the molding to door with same screws (reference part number 20565251). If the screw is rusted, use a new one.

5. Check for NO conductivity between molding and door outer panel use (OHM meter or equivalent).

Parts are currently available from GMSPO.

WARRANTY INFORMATION

Use applicable Labor Ops

Trouble Code 20

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.