Paint - Corrosion On Doors At Lower Edge
90pontiac04Bulletin Number: 89-10-40
Reference Number: 901705R
Publish Date: 2/90
Subject: GALVANIC CORROSION ON DOORS AT LOWER EDGE OF BODY SIDE MOLDING (REPAIR PROCEDURE)
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.
FIG. 1:
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