Dimmable mirrors

[lackovicj]

Hi

You might have seen this thread already but I am newbie here

To start with. When I had old battery my external mirrors automatically dimmed when i started the car(abit annoying as the were abit dark even in the night time), but not the interior one. I replaced battery and all mirrors are bright (as without dimm function) however when the car shine lighs behind me they get kind of greenish color.They dont dimm in a strong sunny day neither.
I read the sensor should be located within the interior mirror facing front and another one facing rear. I wonder if new mirror would solve my issues or if there is something else to check first.

A8 d3 2003 3.7 petrol

Thank you