Why can't the rear windows roll down completely?

[Beatrix]

Due to the limited space in sedans, the doors and tires are already crowded together, resulting in a "top-heavy" door design. There isn't enough space in the lower part of the door to accommodate the entire upper glass panel, so only a portion can be fitted. Below is relevant information about automotive glass: Introduction: Normally, the glass used by OEM suppliers follows a zero-inventory approach, meaning the glass manufacturer provides full vehicle glass sets before the car rolls off the assembly line. Thus, the production dates of all glass panels are generally the same. If they differ, it indicates that the glass was removed and reinstalled during assembly, classifying the vehicle as a reworked unit. However, such rework doesn't necessarily imply quality issues—it might just be minor production adjustments. Vehicle condition assessment: Check if the production dates on all glass panels match. If they do, it suggests the car hasn't been in a major collision. If one panel's date differs from the others, it means that piece was replaced. Additionally, if the windshield's production date is very close to your inspection date, avoid purchasing the vehicle.