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  • Being able to see what's coming up behind you while driving is something a lot of us take for granted; that is, until the rearview mirror is no longer there. When the rearview mirror has parted company with the windshield glass, it's critical to repair or replace the mirror as quickly as possible to remain safe.

    First Steps

    Examine the rearview mirror for cracks or broken parts and take it to an auto parts store for a replacement if it is too damaged to simply reattach. You'll be heading there anyway to pick up a rearview mirror installation kit or to a retailer with a respectably sized auto parts department, because you have a better chance at picking up a kit with fresh adhesive. When you're ready to begin working, park your car in a well-ventilated area to prevent being overcome by the strong fumes from the adhesive. Roll down windows and open doors. Avoid direct sunlight, which may interfere with the adhesive sticking to the windshield. It's also best to pick a day that is clear and moderately humid, because moisture is often the reason that rearview mirrors become detached. If you're attempting the repair in winter, find a heated garage or other enclosed space in which to work.

    Prepping the Area

    Begin by marking the position of the original mirror on the exterior of the windshield using a washable marker or grease pencil. You can usually tell where it was by the adhesive that is left behind, but if not, simply use a tape measure to determine the center of the windshield and mark about 4 inches down from the headliner. Next, use a flat-headed or razor scraper to remove remaining adhesive, and clean the area with rubbing alcohol to remove any oil from your fingers, dirt or remaining adhesive. Sandpaper may also be used to deal with any adhesive that is difficult to remove. The mirror can be removed from the base, called the button, using an Allen wrench or screwdriver, so it won't be in the way as you work. Mark the button with a dot or arrow on the part that faces inside to indicate which way is right-side up. Don't mark the surface that will adhere to the windshield, because you will need to clean the adhesive off of it anyway and lose whatever mark you make. Finally, scrape any old adhesive from the button and clean it in the same manner as the windshield, allowing it to dry thoroughly.

    Making the Repair

    If the glass and button are clean, the button is right-side up, and the temperature's right, you're ready for the adhesive. Apply the adhesive from the kit to the surface of the button, according to the directions---usually a single, generous drop will do it. Press gently but firmly to the glass in the spot you previously marked, and allow at least a minute before you let go. Reattach the mirror to the button after 15 to 30 minutes if necessary; give the button a chance to set overnight to allow the adhesive to dry completely and securely. When you reattach the mirror, be sure not to tug on or apply too much pressure to the button, or you might undo all the careful work you've just completed.

    Source:

    Saturday Mechanic: Reattaching a Rearview Mirror---Popular Mechanics

    Motor Ward: How to Replace Your Car's Rear View Mirror

    CarJunky.com: Reattaching the Rearview Mirror

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