Bulletin No.: 24-NA-026

Service Bulletin

Date: February, 2025

TECHNICAL
Subject:
Brand:

Chevrolet

Convertible Top Water Leak Around Side Glass in High Pressure Car Wash
Model:

Corvette

Model Year:

Build Date Breakpoint:

from

to

from

to

2020

2025

SOP

March 10,
2025

Engine:

Transmission:

All

All

Involved Region or Country

North America, Europe, Middle East, Japan, Australia/New Zealand

Additional Options (RPOs)

Convertible (RPO CM9)

Condition

6543378

Some customers may comment about a water leak from approximately the middle rear of
the side glass area during a touch-less or other high pressure car wash.
Cause

The cause of the condition may be due to slight variations in sealing between the roof
panel seals.

Correction

Follow the Service Procedure outlined below to correct vehicles that may be experiencing
this condition.

Service Procedure
Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws
applicable to the activities it performs under this bulletin, including but not limited to handling, deploying,
preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a
conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you
must follow those applicable laws.
1. Partially retract the top until access to both ends of the top panel are easily accessible.

Copyright 2025 General Motors. All Rights Reserved.

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February, 2025

Bulletin No.: 24-NA-026

6535549

2. Pull on the front side window weatherstrip to remove it.

6535550

3. Remove the front side window weatherstrip retainer by removing these three bolts (size T-25).
4. Cut a 12 mm x 45 mm piece of semi-closed EPDM foam, ¼ inch thick. (See Parts Information)

Bulletin No.: 24-NA-026

February, 2025

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6535551

5. Install the foam as shown in the photo.
Place the long edge of the foam just inward of the rolled outboard edge of the top, but not on the edge itself so
that the foam is less visible when the top is closed. Place the foam’s narrow edge just forward of the trailing
edge of the top panel. Reposition the existing narrow foam strip slightly inboard to accommodate the size of the
added foam.
6. Reinstall the front side window weatherstrip retainer using the three T-25 bolts.
Note: The retainer should cover some of the added foam to help retain it in the event that the adhesive fails over
time.
7. Watch the video before re-installing the weatherstrip.
Important: Weatherstrip installation is sensitive to position, and the leak can be worse than before if the installation
is incorrect.
8. If the customer noted leaks on both sides, repeat this procedure for the remaining side. If not, it may not be
worth disturbing the existing weatherstrip performance.
9. Verify the leak is corrected before returning to customer. If the leak persists, try adjusting the weatherstrip
position again per the video.

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February, 2025

Bulletin No.: 24-NA-026

Parts Information
A sheet of suitable EPDM semi-closed foam can be obtained through Grainger, item ID 60DA20.

6535552

Causal
Part

Description

Part
Number / ID
Number

Qty

N/A

EPDM SemiClosed Foam*

60DA20

1

* We believe this source and their products to be reliable.
There may be additional manufacturers of such products/
materials. General Motors does not endorse, indicate any
preference for, or assume any responsibility for the
products or material from this firm or for any such items
that may be available from other sources.

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

Description

Labor Time

6086068*

Convertible Top Roof Panel
Leak Repair

0.5 hr

Add

Additional Side

0.2 hr

*This is a unique Labor Operation for bulletin use only.
Version

2

Modified

Released February 01, 2024
Revised February 07, 2025 – Added the 2025 Model Year and Build Date Breakpoint.

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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