INFORMATION WINDNOISE

REVISION: 08/16/95

THIS BULLETIN IS BEING REVISED TO ADD AN ADDITIONAL MATERIAL AND P/N FOR RECOMMENDED MATERIALS. ---------------------------------------------------------------------- INFORMATION ----------------------------------------------------------------------

SUBJECT: WINDNOISE

MODELS: 1990-95 BUICK REGAL 1988-94 CHEVROLET LUMINA 1990-95 OLDSMOBILE CUTLASS 1990-95 PONTIAC GRAND PRIX

CUSTOMER COMMENTS REGARDING WINDNOISE MAY BE ADDRESSED BY USING THE PROCEDURES ON THE INDIVIDUAL ITEMS LISTED IN THIS BULLETIN. PROPER DIAGNOSES MAY BE MADE WITH A VARIETY OF TOOLS AND METHODS INCLUDING STETHOSCOPES, DUST GUNS, SONIC INSTRUMENTS, VISUAL INSPECTION, DOLLAR BILL METHOD, ETC. IT IS IMPORTANT TO REMEMBER THAT WINDNOISE CAN BEST BE DESCRIBED AS AIR LEAKING FROM INSIDE OF THE VEHICLE OUTWARD WHILE TRAVELING AT HIGHWAY SPEEDS. TURBULENCE OR WINDRUSH IS BEST DESCRIBED AS AIR PASSING OVER AND AROUND BODY OPENINGS AND MOLDINGS.

IMPORTANT: PRIOR TO ANY REPAIRS, THE DOOR PRIMARY OPENING WEATHERSTRIPS SHOULD BE VISUALLY INSPECTED FOR PROPER GAPS, FITS, WEATHERSTRIP CONTACT AND SEALING. THE VEHICLE SHOULD ALSO BE ROAD TESTED TO DETERMINE LOCATION AND DEGREE OF WINDNOISE/TURBULENCE ON THE VEHICLE.

THE RECOMMENDED MATERIALS (OR EQUIVALENT) TO BE USED WITH THE FOLLOWING PROCEDURES ARE:

MATERIAL P/N

AMERICAN SURE SEAL BEDDING COMPOUND CGB AMERICAN SURE SEAL STRIP CAULK (BLACK) BSC GM GOODWRENCH RTV SILICONE RUBBER 12345336 GM GOODWRENCH RTV SILICONE RUBBER SEALER 12345739 KENT AUTO BEDDING AND GLAZING COMPOUND 10255 KENT TRACING POWER 20065 3M BEDDING AND GLAZING COMPOUND 08509 3M STRIP CAULK 08587 3M LEAK TRACING POWDER 08951

WE BELIEVE THESE SOURCES AND THEIR PRODUCT TO BE RELIABLE. THERE MAY BE ADDITIONAL MANUFACTURERS OF SUCH PRODUCTS. GENERAL MOTORS DOES NOT ENDORSE, INDICATE ANY PREFERENCE FOR OR ASSUME ANY RESPONSIBILITY FOR THE PRODUCTS FROM THESE FIRMS OR FOR ANY SUCH ITEMS WHICH MAY BE AVAILABLE FROM OTHER SOURCES.

CORRECTIONS:

I. WINDSHIELD SIDE REVEAL GAP TO DOOR.

1. ADJUST THE DOOR INBOARD SO THERE IS SLIGHT CONTACT OF THE DOOR FRAME ALONG THE A-PILLAR TO THE WINDSHIELD SIDE REVEAL MOLDING (SEE FIGURE 1).

II. WIND RUSH DUE TO GAP AT WINDSHIELD SIDE REVEAL MOLDING TO GLASS, LEFT AND/OR RIGHT SIDE (SEE FIGURE 1).

1. REMOVE AUXILIARY WEATHERSTRIP TO ACCESS THE WINDSHIELD SIDE REVEAL MOLDING RETAINING SCREWS.

2. REMOVE THE RETAINING SCREWS.

3. HOLDING THE WINDSHIELD SIDE REVEAL MOLDING IN POSITION, FLUSH THE MOLDING TO THE GLASS. DETERMINE HOW MUCH ELONGATION OF THE SCREW HOLES IN THE MOLDING IS NECESSARY TO POSITION THE MOLDING FLUSH TO THE GLASS. USING A SMALL RATTAIL FILE, ELONGATE THE RETAINING HOLES IN THE DIRECTION AND LENGTH NEEDED TO POSITION THE MOLDING FLUSH TO THE GLASS.

4. REINSTALL RETAINING SCREWS AND AUXILIARY WEATHERSTRIP.

LABOR OPERATION: B7570 RIGHT SIDE B7571 LEFT SIDE TO ADJUST SEAL USE PUBLISHED LABOR OPERATION TIME.

III. WINDSHIELD UPPER REVEAL GAPS TO THE ROOF OF LESS THAN 2MM OR LESS (SEE FIGURE 2).

1. WITH 1/2 INCH MASKING TAPE, TAPE THE UPPER REVEAL MOLDING ALL THE WAY ACROSS THE ROOF FOLLOWING THE REAR MOST EDGE OF THE REVEAL MOLDING. TAPE THE ROOF AT THE REAR EDGE OF THE MOLDING ALL THE WAY ACROSS THE CAR.

2. USING GM GOODRENCH RTV SILICONE RUBBER SEALER, P/N 12345739 (OR EQUIVALENT), AND THE NOZZLE FROM THE PACKAGE, FILL THE GAP BETWEEN THE MOLDING AND THE ROOF.

3. REMOVE THE TAPE AND CLEAN ANY EXCESS SEALER ON THE MOLDING AND THE BODY WITH ADHESIVE CLEANER.

LABOR OPERATION: B7540 USE PUBLISHED LABOR OPERATION TIME.

IV. WINDNOISE AT FRONT DOOR WINDOW RUN CHANNEL TO DOOR FRAME (SEE FIGURE 3).

1. LOWER DOOR GLASS.

2. REMOVE THE WINDOW RUN CHANNEL FROM THE RETAINER IN THE HEADER OF THE DOOR FRAME BY PULLING DOWN AND OUTBOARD ON THE RUN CHANNEL.

3. WITH THE RUN CHANNEL REMOVED, MAKE SURE THE RUN CHANNEL RETAINER RETAINING SCREWS ARE TIGHT (SEE FIGURE 5).

4. USING BEDDING AND GLAZING COMPOUND, RUN A 5MM BEAD AROUND THE INBOARD EDGE OF THE RETAINER.

5. USING BEDDING AND GLAZING COMPOUND, FILL THE CAVITY IN THE UPPER REAR CORNER OF THE DOOR FRAME (SEE FIGURE 3, VIEW A). ALSO FILL THE CAVITY IN THE UPPER CORNER ABOVE THE MIRROR WHERE THE RUN CHANNEL RETAINER MEETS THE MIRROR.

6. SPRAY WINDOW RUN CHANNEL WITH GLASS CLEANER, FOR EASE OF INSTALLATION.

7. REINSTALL THE WINDOW RUN CHANNEL, USING A PLASTIC TRIM STICK TO ENSURE THAT THE RUN CHANNEL IS FULLY SEATED IN THE RETAINER.

LABOR OPERATION: C0140 RIGHT C0141 LEFT CHANNEL, FRONT DOOR WINDOW RUN - R AND R OR REPLACE ONLY TOP PORTION OF WEATHERSTRIP USE PUBLISHED LABOR OPERATION TIME.

V. WINDNOISE AT REAR DOOR WINDOW RUN CHANNEL TO DOOR FRAME.

1. LOWER DOOR GLASS.

2. REMOVE THE FRONT AND TOP PORTION OF THE RUN CHANNEL FROM THE RETAINER BY PULLING DOWN AND OUTBOARD ON THE RUN CHANNEL.

3. WITH THE RUN CHANNEL REMOVED, MAKE SURE THE RUN CHANNEL RETAINER RETAINING SCREWS ARE TIGHT (SEE FIGURE 5).

4. USING BEDDING AND GLAZING COMPOUND, RUN A 5MM BEAD AROUND ENTIRE INBOARD EDGE OF THE RETAINER (SEE FIGURE 4, VIEW B). USING BEDDING AND GLAZING COMPOUND, FILL THE CAVITY IN THE UPPER FRONT CORNER OF THE REAR DOOR AND THE UPPER REAR CORNER OF THE DOOR.

5. SPRAY THE WINDOW RUN CHANNEL WITH GLASS CLEANER FOR EASE OF INSTALLATION.

6. REINSTALL THE WINDOW RUN CHANNEL USING A PLASTIC TRIM STICK TO INSURE THAT THE RUN CHANNEL IS FULLY SEATED IN THE RETAINER.

LABOR OPERATION: C0340 RIGHT C0341 LEFT LABOR TIME: 0.3 HR EACH

VI. WINDNOISE DUE TO AIR LEAK AT PRIMARY WEATHERSTRIP TO DOOR FRAME.

DOLLAR BILL TEST

PLACE A DOLLAR OR SIMILAR SIZE PIECE OF PAPER BETWEEN WEATHERSTRIP AND CONTACT SURFACE, THEN CLOSE THE DOOR.

SLOWLY WITHDRAW THE BILL OR PAPER AFTER DOOR IS CLOSED TO CHECK THE AMOUNT OF PRESSURE ON THE WEATHERSTRIP.

THERE SHOULD BE A MEDIUM AMOUNT OF RESISTANCE AS THE BILL OR PAPER IS SLOWLY WITHDRAWN. CONTINUE AROUND THE ENTIRE SEAL AREA. IF THERE IS LITTLE OR NO RESISTANCE, IT INDICATES THERE IS INSUFFICIENT CONTACT TO FORM A GOOD SEAL. THIS TEST MAY INDICATE THAT THE DOOR IS OUT OF ALIGNMENT, ADJUST AS NECESSARY.

LABOR OPERATION: B4000 RIGHT B4001 LEFT DOOR ASSEMBLY - ALIGN USE PUBLISHED LABOR OPERATION TIME.

VII. WINDNOISE AROUND MIRROR.

1. REMOVE THE MIRROR PER SECTION 10 OF THE SERVICE MANUAL.

2. USING BEDDING AND GLAZING COMPOUND RUN A 5MM BEAD AROUND THE PERIMETER OF THE MIRROR MOUNTING SURFACE AS SHOWN IN FIGURE 6.

3. BEFORE THE MOLDING IS RE-INSTALLED, COAT THE OUTER BELT RETAINING FLANGE WITH SILICONE LUBRICANT SO THAT THE MOLDING CAN BE REMOVED AT A LATER DATE.

VIII. WINDNOISE UNDER THE OUTER DOOR BELTLINE REVEAL MOLDING.

1. REMOVE THE OUTER DOOR BELTLINE MOLDING PER SECTION 10 OF THE SERVICE MANUAL.

2. WITH THE MOLDING REMOVED, APPLY A BEAD OF SILICONE ALONG THE FULL LENGTH OF THE MOLDING IN THE MOLDING CAVITY AS SHOWN IN FIGURE 7.

LABOR OPERATION: B7840 2 DOOR B7841 4 DOOR MOLDING AND/OR OUTER STRIP USE PUBLISHED LABOR OPERATION TIME.

IX. ROAD NOISE CAUSED BY INNER BELT SEAL GAP TO GLASS. 1988 TO 1993 SEDANS AND 1988 TO 1995 COUPES.

THE CONDITION ABOVE MAY BE CAUSED BY A MISADJUSTED REGULATOR ARM STABILIZER PLATE.

SEE CORRECTION A OR MISLOCATED INNER BELT PINCH FLANGE (SEE CORRECTION B).

CORRECTION A

THE STABILIZER MAY BE ADJUSTED INBOARD OR OUTBOARD BY BENDING WITH LOCKING PLIERS. IT MAY BE CONSIDERED TO BE ADJUSTED PROPERLY WHEN: (SEE FIGURE 8).

1. THERE IS ENOUGH INBOARD PRESSURE TO PREVENT GLASS MOVING OUTBOARD, CREATING GAPS OF INNER BELT STRIP TO GLASS. BUT NOT SO MUCH INBOARD PRESSURE TO INCREASE BINDING OF THE REGULATOR ARM TO THE STABILIZER.

2. AFTER NECESSARY ADJUSTMENT HAS BEEN COMPLETED, LIGHTLY COAT THE OUTBOARD SURFACE OF THE REGULATOR ARM AND THE INBOARD SURFACE OF THE STABILIZER ARM WHERE THEY COME IN CONTACT WITH LUBRIPLATE OR EQUIVALENT.

LABOR OPERATION: C0100 RIGHT C0101 LEFT GLASS, FRONT DOOR ALIGN USE PUBLISHED LABOR OPERATION TIME.

CORRECTION B

1. AFTER INNER BELT STRIP IS REMOVED, BEND THE INNER BELT PINCH FLANGE OUTBOARD SO THE INNER BELT SEAL TOUCHES GLASS (SEE FIGURE 9).

FIGURES: 9 FIGURE 1 - 1. WINDSHIELD SIDE REVEAL MUST NOT GAP 2. WINDSHIELD SIDE REVEAL MOULDING 3. WINDSHIELD SIDE REVEAL LIP SHOULD CONTACT DOOR FIGURE 2 - 1. WINDSHIELD 2. UPPER REVEAL MOULDING 3. MUST NOT GAP FIGURE 3 - 1. FILL CAVITY 2. BEDDING AND GLAZING COMPOUND FIGURE 4 - 1. FILL CAVITY 2. BEDDING AND GLAZING COMPOUND FIGURE 5 - 1. DOOR FRAME 2. RUN CHANNEL RETAINING SCREW 3. RUN CHANNEL FIGURE 8 - A. REGULATOR ARM B. LUBRICATE THESE SURFACES C. STABILIZER FIGURE 9 - 1. INNER BELT PINCH FLANGE 2. INNER BELT SEAL 3. DOOR GLASS 4. OUTER BELT PINCH FLANGE

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.

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