How to Check the Production Date on Car Window Glass?
4 Answers
Here are the methods to check the production date on car window glass: 1. There is a code at the bottom left or right corner of the window glass. The last or second-to-last row contains a number and several small black dots, which indicate the production date of the glass. 2. If the small black dots are in front of the number, subtract the number of dots from 7; if the small black dots are behind the number, subtract the number of dots from 13. The result is the production month of the glass. 3. Some glass may have a few larger black dots after the production year and month, which are used to specify the week of the month.
I learned how to read the date on car window glass during my regular vehicle maintenance, and found it particularly useful. There's usually a small dot or number marking in the corner of the window, which represents the production year and week code. It's not hard to find: crouch down and look carefully at the edge of the glass. If you see something like '23.' with dots, the number before the dot is the year (e.g., 23 means 2023), and the number after the dot represents the production week (e.g., two dots mean the 2nd week). When checking, you can wipe the glass clean with a cloth for better visibility. Why does this matter? For example, when buying a used car, if the glass date is far from the vehicle's production year, it might indicate the glass was replaced due to an accident. Or, for older cars, aging glass can become brittle and crack, affecting driving safety. I recommend taking a quick look regularly to spot any issues early and address them promptly, rather than waiting until rainy or foggy days when poor visibility could lead to accidents.
Having worked in repairs for so many years, I can tell the production date of car window glass just by looking at the markings. The method is simple: first, find the printed code in the corner of the glass, usually a combination of numbers and dots. For example, '22.2' means the glass was produced in the 2nd week of 2022. The position of the dots indicates different meanings—for instance, a dot after the number represents weeks 1-12, while a dot before the number might indicate the quarter. When checking it yourself, make sure to do it in a well-lit area or use a flashlight for better accuracy. Be cautious if the code is blurry or missing, as the glass might have been replaced or could be of poor quality. This is crucial for assessing the overall condition of the vehicle, especially after an accident, to verify if the glass is an original part and avoid safety risks. I often remind car owners not to overlook this detail—keeping track of it along with maintenance records makes upkeep much easier.
When selecting a used car, I pay special attention to evaluating the condition through the window glass date. Look for small markings in the corners of the glass, where numbers represent the year and dots indicate the week. For example, '20.1' means the glass was produced in the first week of 2020. Clean the glass area to check clearly. If the date doesn't match the car's age, it may indicate a higher risk of accident repairs or fragile glass that could be dangerous at high speeds. Buyers are advised to pay attention to these small details to ensure information authenticity.
