Front Door/A-Pillar - Wind Noise
File In Section: 10 - BodyBulletin No.: 56-15-05A
Date: March, 1996
Subject:
Front Door/A-Pillar Wind Noise
(Install Service Package)
Models:
1988-95 Chevrolet and GMC C/K Models
1990-95 Topkick/Kodiak Models
This bulletin is being revised to change the service procedure, change the glass sealer and adhesive used and change caption wording. Please discard Corporate Bulletin Number 56-15-05 (Section 10 - Body).
Condition
Some owners may comment that their truck has excessive front door or windshield to door wind noise at the A-pillar area.
Cause
A combination of marginal sealing along the windshield header, and the A-pillar to door crevice gap may contribute to excessive wind noise.
Correction
A new, service-only, A-pillar weatherstrip and repair procedure have been released. This includes applying a bead of glass sealer along the windshield roof header and installing the new A-pillar seals.
Service Procedure
1. Take the customer for a test ride in order to verify the condition.
2. Use masking tape to cover the windshield/roof header gap, and gaps between the windshield and doors at both A-pillars. The purpose in doing this is to seal off any crevices that might generate a wind noise.
Important:
Remove any aftermarket equipment such as bug deflectors or window deflectors before the test drive.
3. If this eliminated the customer's concern, remove the masking tape used to cover only the windshield header and re-roadtest. This is to confirm the need to seal or not seal this area.
4. If this test failed to isolate the customer concern, determine the root cause by taping up the rest of the vehicle, section by section, until the source of the wind noise is located.
5. If the second roadtest verified the need to seal the top of the windshield, mask off the top of the windshield encapsulation and the leading edge of the roof with tape so that only the crevice between the roof and windshield is exposed. This will protect the windshield and painted roof surface from damage due to contact with the sealer. (See Figure 1)
6. Obtain locally or from Kem Krest (1-800-955-8591) Permatex Auto Glass Sealer P/N DWS 37 or equivalent, and sparingly apply to the cavity between the roof and windshield encapsulation, following the directions on the package. Note: This product flows into gaps best at or above normal room temperature.
Important:
Do not use any sealer which contains silicone.
Be sure it is smooth and evenly distributed along the entire length of the windshield header. Clean off any excess sealant following the package directions. Remove masking tape and clean off any tape adhesive left behind with adhesive remover.
7. Test fit the A-pillar weatherstrips (P/N 15715158) to the A-pillar encapsulation (See Figure 1) and clean the areas of contact. Remove the weatherstrips.
8. Apply a 1/8th inch thick bead of GM Weatherstrip Adhesive, P/N 12345097 (available from Kern Krest) or equivalent, to the inside crevice of one A-pillar weatherstrip.
9. Install and align the weatherstrip to the A-pillar windshield encapsulation then repeat the process for the other side.
10. Once the adhesive is dry, roadtest to verify the customer concern is corrected.
Parts Information
P/N Description Qty
15715158 Weatherstrip, A-pillar 2
Service Only
12345097 GM Weatherstrip 1
Adhesive
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
C0020 Glass, Windshield Use Published Labor
Reseal Operation time