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NHTSA ID Number: 10198878
Manufacturer Communication Number: 21NA101
Summary
This service bulletin provides a procedure to replace both front door seals to correct a customer concern of Howl, Hoot, or Whistle Type Noise when Driving in Crosswinds.
Condition
Some customers may comment on a noise in high crosswinds originating from the vehicle “A” pillar area.
The noise may be altered or eliminated by folding the mirrors.
Cause
The cause of the condition may be that the door seals are too soft.
Correction
Verify that the doors are within specifications and replace both front door seals with revised seals (weatherstrips) if necessary.
Service Procedure
If you encounter a vehicle with the above concern, verify that the vehicle’s door is within the below specifications and adjust as necessary.
Parts Information
| Description | Part Number | Side |
| WEATHERSTRIP FRT S/D | 84741674 | Right |
| WEATHERSTRIP FRT S/D | 84741673 | Left |
4 Affected Products
Vehicles
1 Associated Document
Manufacturer Communications
Bulletin No.: 21-NA-101
Date: May, 2021
MC-10198878-9999.pdf 982.267KB
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SEOCONTENT-START
Copyright 2021 General Motors
LLC. All Rights Reserved.
Service B n
Bulletin No.: 21-NA-101 TECHNICAL
Date: May, 2021
Subject: Howl, Hoot or Whistle Type Noise when Driving in Crosswinds Brand: Chevrolet Model: Silverado 1500 (Crew Model Year:
from to Build Breakpoint Date: from to December Engine: Transmission: and Extended Cabs Only) 2020 2021 SOP 20, 2020 All All Involved Region or Country Additional Options (RPOs) Condition Cause Correction North America, Middle East, Australia/New Zealand Vehicles Equipped with Crew or Extended Cabs Only
Some customers may comment on a noise in high crosswinds originating from the vehicle “A” pillar area.
The noise may be altered or eliminated by folding the mirrors.
The cause of the condition may be that the door seals are too soft.
Verify that the doors are within specifications and replace both front door seals with revised seals (weatherstrips) if necessary.
Service Procedure If you encounter a vehicle with the above concern, verify that the vehicle’s door is within the below specifications and adjust as necessary.
5812858
If the vehicle door adjustment is verified to be within the above specifications and the condition is still present, replace the left and right front door weatherstrip. Refer to the correct Front Side Door Weatherstrip Replacement in SI.
Important: For vehicle Model Year 2020 ONLY: Once the vehicle’s weatherstrips are replaced, re-verify that the vehicle doors are within the above specifications.
Parts Information Causal Part
X X Description WEATHERSTRIP FRT S/D
WEATHERSTRIP FRT S/D Part Number
84741674 84741673 Side Right Left Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information. Labor Operation
1481548*
Add Description Verify/Adjust Doors and Test
Replace Both Front Doors Weatherstrips Labor Time 0.3 hr
0.8 hr *This is a unique Labor Operation for bulletin use only. Page 2 May, 2021 Bulletin No.: 21-NA-101 Version Modified 1
Released May 10, 2021
GM bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these 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 your GM dealer for information on whether your vehicle may benefit from the information.
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CERTIFICATION
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