Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Rear And Side Tempered Glass Spots (Quench Marks) (PI0754G)
Reference number: PI0754G
Supersedes refnos: PI0754, PI0754A, PI0754B, PI0754C, PI0754D, PI0754E, PI0754F
REAR AND SIDE TEMPERED GLASS SPOTS (QUENCH MARKS)
TECHNICAL SERVICE BULLETIN
| Affected Model(s): | 2025 and Prior GM Passenger Cars and Trucks |
| Attention: | This PI also applies to any of the above models that may be Export from North America vehicles. |
| Supercedes: | This PI has been revised to add 2024-2025 Model Years and Important statement. Please discard PI0754F. |
CONDITION/CONCERN
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.
Shown in the pictures above are examples from the Cadillac CT4 and CT5 models, which are different from the typical "cheetah" spots.
Some customers may comment on spots showing on the rear and side windows when the vehicle is in the sunlight. When wearing polarized glasses/sunglasses, these spots may be more magnified.
The spots are due to the manufacturing process and are "quench marks" in the glass. Quench marks are an unintentional side effect of the tempering process.
RECOMMENDATION/INSTRUCTIONS
Technicians should explain to the customer that this is a normal condition and part of the manufacturing process for tempered glass. Do not replace the window(s) for this condition.
These spots will not be seen on front windshields.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.