PI0754A

File in Section:
Service Bulletin
Bulletin No.:
Date:
PI0754A
December, 2013
PRELIMINARY INFORMATION
Subject:
Rear and Side Tempered Glass Spots (Quench Marks)
Models:
2014 and Prior GM Passenger Cars and Trucks
This PI has been revised to add the 2014 model year. Please discard PI0754.
Condition/Concern
2877710
2877713
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.
Note: This will not be seen on front windshields or laminated side glass.