Re: [MBZ] 240D HVac

[Rich Thomas via Mercedes]

I'll look around for it the next coupla days.  I recall the ones I have 
are only about 2" long and the body is only maybe 1" dia.  One is still 
in the bag though, so will have the part #.


--R

On 5/9/15 6:41 PM, Curly McLain via Mercedes wrote:

Here is the par number:
123 800 31 75
Genuine Mercedes - A/C Vacuum Actuator; For Leg Room Flap
1 per car.
  It is round, about 2" dia and about 2" long.


I think I have a 123 vac pod that came with the 79 TD, it might still 
be in the glove box or in some parts bin, I am guessing it would 
either be the same or would work.  There are 3 of these in the TD, 
the PO who was a mechanic asserted that the pods were the reason the 
AC was not working and provided 2 of them new with the car, though 
after changing one (a miserable job up under the dash and behind the 
glove box) I determined that the cause was a leaky refrigerant system 
and never further messed with it.  If you want I can check to find it 
and if it would work I can send it along.  I might have kept the old 
one too, which was actually working but it would now be 36yo whereas 
the newer one would be more like 13 or 14, whenever we bought the car.


--R

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Re: [MBZ] 240D HVac

[Curly McLain via Mercedes]

Here is the par number:
123 800 31 75
Genuine Mercedes - A/C Vacuum Actuator; For Leg Room Flap
1 per car.
  It is round, about 2" dia and about 2" long.


I think I have a 123 vac pod that came with the 79 TD, it might 
still be in the glove box or in some parts bin, I am guessing it 
would either be the same or would work.  There are 3 of these in the 
TD, the PO who was a mechanic asserted that the pods were the reason 
the AC was not working and provided 2 of them new with the car, 
though after changing one (a miserable job up under the dash and 
behind the glove box) I determined that the cause was a leaky 
refrigerant system and never further messed with it.  If you want I 
can check to find it and if it would work I can send it along.  I 
might have kept the old one too, which was actually working but it 
would now be 36yo whereas the newer one would be more like 13 or 14, 
whenever we bought the car.


--R

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Re: [MBZ] 240D HVac

[Rich Thomas via Mercedes]

I think I have a 123 vac pod that came with the 79 TD, it might still be 
in the glove box or in some parts bin, I am guessing it would either be 
the same or would work.  There are 3 of these in the TD, the PO who was 
a mechanic asserted that the pods were the reason the AC was not working 
and provided 2 of them new with the car, though after changing one (a 
miserable job up under the dash and behind the glove box) I determined 
that the cause was a leaky refrigerant system and never further messed 
with it.  If you want I can check to find it and if it would work I can 
send it along.  I might have kept the old one too, which was actually 
working but it would now be 36yo whereas the newer one would be more 
like 13 or 14, whenever we bought the car.


--R



On 5/9/15 4:46 PM, Curly McLain via Mercedes wrote:

On Sat, 9 May 2015 13:34:21 -0500 Curly McLain via Mercedes
 wrote:


 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.


Now that's odd. I have never heard of a vacuum pod on the right side 
of a

240D; all of the documentation I have makes no mention of it.

If I didn't have so many things to do, I'd go out and look at our car.


Craig


Got it!

I finally figured out I had a T connector i was using with the (HF Not 
mity) vac pump that was leaking, giving me 0 vacuum on every test.  
After I changed that the electric/vacuum switch by 107 was good, as 
was the rest of the line back to the start in front of the firewall.  
The number 107: "vacuum element for leg room flap" holds no vacuum, so 
that is the culprit.  Guess I'll ask Tom Hanson at the classic Center 
the cost of that and the door lock pod.


BTW, the book does not show the vacuum/electric switch for 107. Both 
are located in front and to the right of the glove box.


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Re: [MBZ] 240D HVac

[fmiser via Mercedes]

> Curly wrote:
> 
> 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.

Vacuum is used in the manual HVAC system?  

I guess it's been too long since I had the dash all torn out - but
I don't remember any vacuum for the HVAC...

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Re: [MBZ] 240D HVac

[Curly McLain via Mercedes]

On Sat, 9 May 2015 13:34:21 -0500 Curly McLain via Mercedes
 wrote:


 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.


Now that's odd. I have never heard of a vacuum pod on the right side of a
240D; all of the documentation I have makes no mention of it.

If I didn't have so many things to do, I'd go out and look at our car.


Craig


Got it!

I finally figured out I had a T connector i was using with the (HF 
Not mity) vac pump that was leaking, giving me 0 vacuum on every 
test.  After I changed that the electric/vacuum switch by 107 was 
good, as was the rest of the line back to the start in front of the 
firewall.  The number 107: "vacuum element for leg room flap" holds 
no vacuum, so that is the culprit.  Guess I'll ask Tom Hanson at the 
classic Center the cost of that and the door lock pod.


BTW, the book does not show the vacuum/electric switch for 107.  Both 
are located in front and to the right of the glove box.


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Re: [MBZ] 240D HVac

[Curly McLain via Mercedes]

On Sat, 9 May 2015 13:34:21 -0500 Curly McLain via Mercedes
 wrote:


 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.


Now that's odd. I have never heard of a vacuum pod on the right side of a
240D; all of the documentation I have makes no mention of it.

If I didn't have so many things to do, I'd go out and look at our car.

Craig



Broke out the books finally:

the diagram at 80-900 shows 3 vacuum components for 123.1, but it 
does not identify them or their function.


80.4-901/2 Diagram identifies and shows 3 vac components.
   104: vacuum rotary switch for recirculating air flap
   105:vacuum pull switch for leg room air flap
   106: vacuum element for circulating air flap
   107: vacuum element for leg room flap

104 and 105 appear to be the same unit according to the diagram. 
They are all related to air conditioning.  The air conditioning does 
not work, and I don't anticipate resurrecting air cond in the next 
few years.  Driving with the windows down works for me, as long as 
the heater works!


So I think I will put Humpty back together again, and let it be.  I 
have no appetite for a evapectomy size job.  I'll RTFM a little more 
to see if I find anything more.  It appears that this is the first 
time i opened the books since 2003, according to the envelope I used 
as a bookmark.  This car has only travelled 1000 mi in the last 5 
years, and not much more than 2000 in the last 12 years or so.


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Re: [MBZ] 240D HVac

[Craig via Mercedes]

On Sat, 9 May 2015 13:34:21 -0500 Curly McLain via Mercedes
 wrote:

> 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.

Now that's odd. I have never heard of a vacuum pod on the right side of a
240D; all of the documentation I have makes no mention of it.

If I didn't have so many things to do, I'd go out and look at our car.


Craig

--
Present: '82 240D/3.0   Bluebell   267 kmi (Still need to fix leaking
oil pressure gauge and do
something about the failed
hood paint)
 '89 Chevrolet G20 Beauville Van (affectionately dubbed the BRV,
 the Big Red Van)
Past:'95 E320   Sebastian  135 kmi   RIP
 '94 E420   Oskar  127 kmi   RIP
 '86 190E/2.3
 '72 220/8
 '64 190Dc  Emma
 '72 220D/8 Herman 186 kmi
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Re: [MBZ] 240D HVac

[Curly McLain via Mercedes]

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
 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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Re: [MBZ] 240D HVac

[Craig via Mercedes]

On Sat, 9 May 2015 11:27:13 -0500 Curly McLain via Mercedes
 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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