Hello X?,

Not sure which design a 95 have, but
read this:

http://www.benzworld.org/forums/w140-s-class/1252973-how-do-i-remove-center-vent
s.html
or look at my images for a 98;

http://www.pvv.org/~syljua/merc/W140/S320%20DIY%20Blog/7AAD1910-B5B2-11DA-A130-0
00A959CE708.html

br,
syljua

I have a '95 S420 and have been down this road to replace the controller.

Here's what you do...

Plan A - I think I remember that you can gently pop off the HVAC button or
temp indicator in question, and change the bulb using some standard fishtank
airline.  You just slip a piece of the tubing over the offending bulb and
use it as a wrench to unscrew the bulb.  For confirmation, Google for it...I
think I saw it on the internet somewhere.

If that doesn't work

Plan B -
1) Google again and try to use Plan A.

2) If that doesn't work, start car and shift into 2nd to get the shifter out
of the way.  Turn off car.

3) Remove gear shift knob.  Rotate bottom section of knob CCW (I think)
about a 1/4 turn...knobs pops right off.

4) Remove black plastic trim ring around shifter.  It pops right off, but
ease it up bit by bit around the whole perimeter.

5) Unscrew wood trim plate on front of ashtray.  Requires offset screwdriver
and patience.

6) Cock the ashtray forward about half way...this exposes 2 torx head screws
under the back lip of the ashtray hole.  The screws point towards the back
of the car and hold the lower wood trim to the upper.  Find the right size
torx wrench to break the screws loose, then go to the next smallest size to
unscrew until you can get your fingers on them.  You'll go nuts trying to
re-engage the right size wrench for each 1/3 turn after they're free.
IMPORTANT: Don't drop the screws down into the cavity under the wood trim
panels...recovery is a major hassle.

7) Carefully pull BOTH trim panels up at the same time by holding the seam
you just unscrewed together.  The top of the vertical trim and the back of
horizontal trim have little tabs that hold them down.  By pulling both up at
the same time in the middle, they will kind of "fold" at the seam and open
up, releasing the tabs.  I tried one at a time, and broke the tabs off the
horiz trim...$646 for a new one.  Also, try to disturb the back edge of the
horiz trim piece as little as possible.  At least on mine, the rear seat
headrest switch connector loves to fall off.  It's really annoying to go
through all of this just to put the connector back on.

8) Pull them up just enough so that the vert trim just clears the horiz trim
piece.  Then push the very top edge of the vert trim piece into the dash,
while pulling the bottom edge out and up.  As the bottom edge comes up, the
top edge will finally hit an angle where you can pull it out from between
the top of the dash, and the row of buttons along the top of the trim piece.

9) With the trim piece out, the HVAC controller is held in by 2 screws at
the top corners.  Unscrew them, and the module pulls straight out.

10) The module has a big connector on each side.  Pull them by lifting the
tab on the connectors that is towards the front of the module.  Done.

To reinstall, just reverse the procedure.

Couple of notes...

A) The first time you do this is a pain but once you get the hang of it,
it's no big deal.

B) Be very careful with the trim pieces.  They are a laminated sandwich of
several layers of aluminum, plywood, veneer, and lacquer.  The piece itself
is very strong, but the edges chip very easily.  Also, be careful when
flexing them, especially the thin edges between the sides of the console and
the radio & HVAC module.  It is possible (very possible) to flex them enough
to introduce hairline cracks in the surface lacquer well before you do any
damage to the trim itself.  If that happens, you have 3 choices...live with
it, buy a new one and hope you don't crack it again putting it in, or sand
it all the way down to the veneer, re-lacquer it, and then hope you don't
crack it when you put it back in.

Good luck...John