Outside Rear View Mirrors - Wind Whistle
File in Section: 10 - BodyBulletin No.: 56-15-02
Date: August, 1995
Subject:
Wind Whistling Noise from Outside Rear View Mirrors (Install Mirror Gasket Kits)
MODELS:
1994-95 Chevrolet and GMC Truck S/T Pickups
1995 Chevrolet and GMC Truck S/T Utilities
Built Prior to the VIN Breakpoints in chart.
CONDITION
Some owners may comment that they hear a whistling noise from outside the side windows at highway speeds. The passenger side noise is usually more prevalent.
CAUSE
Wind penetrates the horizontal and vertical "break-away" gaps on the outside rear view mirrors causing a whistling sound.
CORRECTION
To reduce this wind noise, remove the mirror head from the mirror base and install horizontal and vertical gaskets at the "break-away" gaps.
Service Procedure
1. Place one hand on the lower outboard corner of the mirror head, then place the other hand on the upper inboard corner of the mirror head. (Figure 1)
2. Apply firm sharp upward pressure with the hand at the lower outboard corner of the mirror head. This action is necessary to overcome the snap-on lip inside the mirror head.
3. Once the snap-on lip has been overcome and the mirror has been loosened, use a see-sawing movement to work the mirror head upward along its internal post.
Important:
It is not necessary to disconnect any wires located in the power mirror head.
4. Clean the "break-away" gap area on the mirror head and on the mirror base (a soap and water solution is acceptable).
5. Dry the area thoroughly to allow for maximum gasket adhesion.
6. Apply one gasket to the forward-facing horizontal surface of the mirror base, using the cut-out slots as locators. (Figure 2, Item 1)
7. Apply one gasket to the vertical surface of the mirror head using the two locator tabs as guides. (Figure 3)
Important:
For ease of installation, it is simplest to start with the wide end of the vertical gasket.
8. Inject an expandable-type insulating foam (Kwik Foam from DAP or equivalent) into the mirror base post so that it is approximately 25% full. When the foam expands, it will prevent a "pop bottle-type" whistling noise. This foam can be procured locally at most major hardware stores or home centers. (Figure 2, Item 2)
9. Reinstall the mirror head on the base.
Important:
It may be necessary to use a firm sharp impact (with the edge of the hand) at the breakaway gap to properly seat the mirror back on the base.
10. Repeat steps 1-9 for the other outside rear view mirror.
PARTS INFORMATION
Parts are currently available from GMSPO.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Labor
Operation Description Labor Time
R3420 Gasket, Mirror Head - 0.3 hr
Install (both sides)