I’m almost embarrassed to say that it’s taken me this long to fix this. About a month ago I was driving in what was Las Vegas’ hottest day. It hit 115 or 116. Anything over 110 is brutal. Some movement caught my right peripheral vision. I focused in on that movement just in time to see my rear-view mirror slowly fall from the windshield.
I purchased rear-view mirror adhesive from Ace Hardware when I was there last time. It is a two part adhesive with glue and hardener separate.

Rear-view Mirror Adhesive
It was easy to figure out where the mounting plate for the mirror was because of where the tint was cut out. Otherwise it would be necessary to outline where to attach the plate when gluing.

Original Mounting Plate Area
The old adhesive was scraped off with a razor, and the surface was cleaned with soapy water.

Scraping Old Adhesive
Once the area was dry, the hardener vial is snapped and applied with the felt portion.

Snapping Hardener Vial

Applying Hardener
Allow the hardener to dry for about 5 minutes. A drop of the adhesive is applied to the back of the mounting plate, and held against the glass for another 5 minutes.

Holding Mounting Plate
After waiting 15 minutes for the adhesive to dry, the rear view mirror is put on the mounting plate and tightened down.

Screwing Mirror On Mounting Plate
Wow this is a great resource.. I’m enjoying it.. good article
I’m Havin’ the same problem i’m ganna do it as you did .
I hope its working .
Mine is still hanging on strong after being fixed that one time.
My problem is different. I have an ’06 unlimited, and the mirror fell off, and is dangling there with wires for temp. etc. I can see the “button” but can’t get it off to glue separately. No screw on top to release it. The “button” seems to be held by two prong-thingies, that press into it. Can’t wedge it out with a screwdriver. Any one offer a hand?
Thanks.
Oops, never mind. Found the screw. Getting old, I guess. Thanks for reading, though, and for the support. P