One problem related to side/rear glass has been reported for the 1998 Buick Lesabre. The most recently reported issues are listed below.
I was pulling into my garage last night when the rear window on my vehicle shattered into a million pieces. There are no visible holes or dents in the window where something might have hit it. The rear window defroster was operating normally and it was a cold evening. I took pictures with my digital camera and the window is being replaced today.