Cadillac STS Forum - 2005 through 2012 Discussion, Replacing glass in side mirror that turned brown in Past Cadillac Vehicle Discussion; My drivers side mirror on 2008 STS has turned brown, which I know is not uncommon. Replacement glass from GM ...
My drivers side mirror on 2008 STS has turned brown, which I know is not uncommon. Replacement glass from GM was $140 (CAD$) which I assume would be a plug-n-play replacement. I bought an aftermarket piece instead for $25. Here are some notes and pics of the install. I was interested to find that the 'brown' was actually a liquid between two panes of glass. I used ddalder's post about disassembly which was very helpful; http://www.cadillacforums.com/forums...eassembly.html
With a bit of work I was able to remove the oem glass from the plastic backing plate. The hardest part was getting the bezel off without damaging it. Once that was off it was pretty easy to separate the glass from the plastic backing plate using a putty knife. I attached the new glass with the supplied double-sided tape and used epoxy to re-attach the bezel. Of course I lost the heat & auto-dim functions but at least I can see clearly in the mirror now. Maybe in the future I'll spring for the oem piece.
Hope this might be of use to others with the dreaded 'brown' mirror.
Re: Replacing glass in side mirror that turned brown
In the STS, only the driver's outside mirror has that fluid but on some GM models the passenger side also has this feature. It's for electrochromic dimming and will darken the same as your inside rear view mirror (which has the same fluid). A small voltage of less than 2V causes it to change.