WINDNOISE, DOOR AND DOOR GLASS AREAS (DIAGNOSIS AND P/N)

MODELS AFFECTED: 1988 REGALS

Customer comments regarding windnoise on 1988 Regals may be addressed by using the procedures on the individual items listed in this bulletin.

Proper diagnosis can be made with a variety of tools and methods including stethoscopes, dust guns, sonic instruments, visual inspections, etc. It is important to remember that windnoise can best be described as air leaking from the 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. Prior to any repairs, the door auxiliary weatherstrips and door opening weatherstrips should be visually inspected for proper gaps, fits, weatherstrip contact and sealing. The vehicle should also be road tested to determine the location and degree of windnoise/turbulence on the vehicle.

A primary area of windnoise may be at the rear upper corner of the door glass area and/or the front upper corner of the door glass next to the mirror and filler. Either area may be due to an unsealed run channel and/or run channel retainer to the door frame.

Parts Required:

Run Channel Retainer Seal - Part Number 10120492-3 (Right and Left)

Run Channel - Part Number 10120598-9 (Right and Left)

Parts are expected to be available on August 1, 1988. Until then, normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be cancelled as incorrectly ordered while the 400 control is in place.

The recommended repair is to replace the existing retainer seal and to replace the run channel with a new part which has larger seal pads at the corner locations.

Remove:

1. Door trim panel, inner belt seal strip and retainer.

2. Mirror, filler and control cable (if equipped).

3. Outside door handle and cover from door frame.

4. Run channel from door by disengaging door glass.

5. Run channel retainer from door frame.

Install:

1. New foam seal strip on run channel retainer as shown in Figure 1.Install retainer to door frame and locate all attaching holes with a scratch awl.

Note: If noise present at lower ends of garnish moldings, it is advisable to add seal pads at this time (See Figure 3).

2. New run channel to door frame and retainer. Make sure that the front and rear outside flaps are properly positioned over the door frame flanges.

3. Door glass to run channel and cycle door glass to insure proper operation and insertion to the run channel in all areas.

4. Mirror, filler and control cable. Note: If windncise was present in the mirror/filler area, it is advisable to replace the filler gasket at this time.

Parts Required:

Part Number 10102602-3 (Right and Left)

5. Outside door handle and cover.

6. Inner belt seal strip by locating as far forward as possible and pushing downward over the inner panel flange. Reinstall the belt strip retainer.

7. Recycle the door glass to insure proper operation.

8. Reinstall the door trim and road test to insure a satisfactory repair.

ADDITIONAL AREAS OF WINDNOISE POTENTIAL ARE:

* Outside rear view mirror/filler to door frame. Install new filler gasket. Part Number 10102602-3 (Right and Left)

* Glass guides to door glass (front or rear): Not sealed to glass, or "step" from guide to glass at run channel sealing area.

- Clean inside surface of glass at guide area with alcohol. - Apply silicone sealer to seal the guide to glass and/or "bridge" the step from guide to door glass (see Figure 2). - Wet or moisten finger and smooth material into position. - Allow 1.0 hour to dry.

* Road noise from door at lower ends of garnish moldings.

- Apply black foam rubber between outside surface of garnish molding and door frame at front and/or rear (see Figure 3).

- May use 3M#4504 1/4" thick or 3M#4508 1/8" thick., or equivalent.

WARRANTY INFORMATION

Labor Operation Number:

T1361 One Side T1362 Both sides Run Channel Retainer Seal Strip, Run Channel Replacement, Mirror Gasket and Garnish Molding Seal Pads.

Labor Time: 1.0 Hour One Side 2.0 Hour Both Sides Trouble Code: 92

Labor Operation Number: T1363 Left Side Sealing door glass guides to glass.

T1364 Right Side

Labor Time: .4 Hours Trouble Code: 92

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.