CAB FLOOR CRACKED AT FRONT SEAT ANCHOR REINFORCEMENT. GMC Truck Sonoma Pickup

SUBJECT: CAB FLOOR CRACKED AT FRONT SEAT ANCHOR REINFORCEMENT SPOT WELDS (REPLACE REINFORCEMENT AND WELD FLOOR CRACKS)

MODELS: 1994-95 CHEVROLET AND GMC S/T MODELS EXCLUDING EXTENDED CAB

CONDITION:

SOME OWNERS MAY COMMENT ABOUT SEAT NOISE AND/OR MOVEMENT. THIS CONDITION MAY ALSO BE REPORTED AS THE SEAT BEING LOOSE BUT THE ANCHOR BOLTS ARE TIGHT.

CAUSE:

THE CAB FLOOR IS CRACKED IN THE AREA AROUND THE SPOT WELDS OF THE FLOOR PAN SEAT ANCHOR REINFORCEMENT.

CORRECTION:

REPLACE EXISTING REINFORCEMENT AND WELD FLOOR CRACKS.

SERVICE PROCEDURE:

1. DISCONNECT SEAT ELECTRICAL HARNESS. 2. REMOVE SEAT. 3. REMOVE FRONT SILL PLATE AND KICK PANEL. 4. REMOVE LOWER SEAT BELT ANCHOR BOLT AND REPOSITION BELT FOR WELDING CLEARANCE. 5. ROLL CARPET/PADDING BACK FOR WELDING CLEARANCE. 6. PROTECT AREA WITH WELDING BLANKETS (INCLUDE UNDERSIDE OF STEERING WHEEL AND COLUMN). 7. DRILL 1/8" (3MM) HOLE AT END OF EACH FRACTURE. 8. DRILL OUT EXISTING SPOT WELDS USING 5/16" (8MM) DRILL BIT. 9. DRILL 5/16" (8MM) HOLES FOR NEW PLUG WELD LOCATIONS IF NECESSARY. SEE FIGURE 1 FOR RECOMMENDED SPACING. 10. GRIND AND PREP AREA FOR WELDING. 11. RAISE VEHICLE TO ACCESS UNDERBODY. 12. USE HAMMER AND CHISEL TO REMOVE REINFORCEMENT. DISCARD REINFORCEMENT. 13. USE HAMMER AND DOLLY TO FLATTEN AREA TO BE WELDED. 14. GRIND AND PREP UNDERBODY AREA TO BE WELDED. NOTICE: AREA SHOULD BE FREE OF DIRT AND CONTAMINATION TO 1/2" BEYOND PERIMETER OF REINFORCEMENT. 15. SHIELD FUEL TANK. 16. APPLY PRIMER TO REINFORCEMENT AND REINFORCEMENT LOCATION ON UNDERBODY. 17. POSITION REINFORCEMENT WITH A NUT TO HOLD IN PLACE. 18. FROM INSIDE VEHICLE, REMOVE PRIMER FROM AREA TO BE PLUG WELDED USING A SPOT BLASTER POSITIONED OVER DRILLED HOLES. 19. PLUG WELD LOCATIONS 1 AND 3 (FIGURE 1) AS PER AWS (AMERICAN WELDING SOCIETY) STANDARDS. 20. REMOVE NUT USED FOR POSITIONING REINFORCEMENT. 21. PLUG WELD LOCATIONS 2 AND 4 AS PER AWS STANDARDS. 22. WELD EACH FRACTURE IN FLOOR PAN (IF PRESENT) USING GMAW (GAS METAL ARC WELD) OR GTAW (GAS TUNGSTEN ARC WELD) TECHNIQUES. 23. SAND BLAST INTERIOR WELD SURFACE TO ENSURE PRIMER ADHESION. 24. USING A BRUSH, APPLY TWO (2) COATS OF EPOXY PRIMER TO INTERIOR AND UNDERBODY SURFACES. 25. APPLY SEAM SEALER AROUND THE PERIMETER OF THE REINFORCEMENT ON THE UNDERBODY. 26. INSTALL CARPET. 27. INSTALL FRONT SILL PLATE AND KICK PANEL. 28. INSTALL SEAT BELT AND SEAT BELT ANCHOR BOLT. TORQUE TO 70 +/- 10 NM (52 +/- 7 LB FT). NOTICE: SEAT BELT ANCHOR BOLT TO BE FULLY DRIVEN, SEATED AND NOT STRIPPED. 29. INSTALL SEAT. TORQUE SEAT ANCHOR BOLTS TO 45 +/- 7 NM (33 +/- 5 LB FT). 30. CONNECT SEAT ELECTRICAL HARNESS WHERE REQUIRED.

PARTS INFORMATION

P/N DESCRIPTION QTY 15999714 REINFORCEMENT 1/SEAT ANCHOR

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME A9300 PAN, FLOOR - REPAIR 0.5 HR ADD: TO REPLACE REINFORCEMENT 0.9 HR

IMPORTANT: LABOR OPERATION IS CODED TO BASE VEHICLE COVERAGE IN THE WARRANTY SYSTEM.

FIGURES: 1

CAPTIONS: SEAT ANCHOR REINFORCEMENT - RECOMMENDED WELD PLACEMENT

Object Number: 169281 Size: MF

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.