You can get the glass off the mirror button with a torch or heat gun and a putty knife.
Rear view mirror fell off windshield chunk glass.
Yesterday i hopped into my 2001 a4 a secondary car for me and i noticed the mirror was dangling from the windshield.
I was just adjusting the mirror on my 2004 wrx when it just fell off.
You could try to fit that chunk back in there.
The rear visibility of your car gets reduced if rear view mirror falls off.
You can use glue to put the mirror back on but if you live in an area were the weather changes from hot to cold or visa versa the windshield may crack.
At times we see that rear view mirror fell off that creates problem to the driver.
Or just fill the hole in and then re mount right below or next to it.
In case you have not secured rear view mirror to the roofs by making use of screws then it will glue to the windshield.
With time your rear view mirror comes out.
It s on a 2004 wrx and the windshield is aftermarket pilkington glass.
I ve seen this happen on numerous occasions twice to myself.
The mirror on an 08 nissan altima fell off taking a chunk of glass out.
I pulled it down and noticed that there was a chunk of glass glued to the button and a roughly 1 4 asymmetrical crease in the windshield where the mirror used to go see below.
It s a bit odd.
Auto parts stores sell a rear view mounting repair kit thingy.
I work at a retailer where we used to install onstar mirrors.
If not you can fill the hole with plate glass resin or pit resin cure scrape and polish to get a smooth surface.
This is also true if you hit pot hole or bump.
If you are careful you may be able to get the glass off in one piece and glue it back in place with repair resin or rear view mirror adhesive.
There is a hole about the size of a nickel not completely through the windshield and the chunk of glass is still attached to the mirror base.
It s been a while since i ve done this.
Went to walmart and they had the permatex repair adhesive kit.