Since most of the 240D system is manual, thankfully, I am trying to
figure out what is missing if I just leave the HVAC vacuum system
unhooked. There is a flapper on the far right that is supposed to
pull in and close the flap with vacuum. The default leaves the far
right dash vent open. I don't see any problem with leaving that vent
open. I have not figured out what else the vacuum does.
I have taken apart all I can without taking out the fronts seats and
the console, but I still don't see other vacuum connections or lines.
A green yellow tube runs under the windshield near the firewall just
under the window to the vacuum pod at the far right.
On Sat, 9 May 2015 11:27:13 -0500 Curly McLain via Mercedes
<mercedes@okiebenz.com> wrote:
I have the underdash panels off, and I don't see where the vacuum
line goes under the dash. I found a good illustrated How to for the
ACCII system, but don't see one for the 240D manual heater. Anyone
BTDT?
The HVAC vacuum hose in front of the firewall is a complete "open"
So far, I have not found the vacuum line under the dash.
When I was working on our '82 240D/3.0, I had no trouble finding the
vacuum lines, so I don't remember exactly where they come through. As I
recall it's higher inside the passenger compartment under the dash than
you would expect. Try following the vacuum lines to the ignition switch
from the ignition switch back to the firewall.
Craig
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