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  #1  
Old 06-19-2019, 02:45 PM
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Join Date: Apr 2011
Location: Toronto, Canada
Posts: 269
W123 1985 300D - Center Vents - not working - never worked

Hi there,

My two center vents are not opening/working (#3 in picture below). I assume but will confirm this is the vacuum actuator. Can you guys confirm this is part #A 116 800 11 75 VAC. ELEMENT FOR CENTRAL NOZZLE AIR FLAP?

Is it best practices to replace all parts or is this the most common?

-A 116 800 11 75 VAC. ELEMENT FOR CENTRAL NOZZLE AIR FLAP
-A 123 800 32 75 VAC. ELEMENT FOR DEFROSTER AIR FLAP
-A 123 800 31 75 VAC. ELEMENT FOR LEGROOM AIR FLAP
-A 123 800 11 75 VAC. ELEMENT FOR MAIN AIR FLAP
-A 123 800 12 75 VAC. ELEMENT FOR CIRCULATING AIR FLAP

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1976 Mercedes 240D (Sold)
1985 Mercedes 300D Turbo Diesel: 500,000KM
1986 Mercedes 300E (Sold)
1988 Mercedes 300E (Sold)
2002 Mercedes C240 (Sold)
2008 Mercedes C350 4matic

A great site for purchasing industrial rubber products!

Industrial Rubber
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  #2  
Old 06-19-2019, 03:34 PM
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Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,150
From what I've seen and read, the vacuum actuator is the most common problem. The part# you mentioned is what Peach Parts comes up with.
https://www.pelicanparts.com/catalog/SuperCat/3306/MBZ_3306_VENTAC_pg1.htm#item2
Several members recommend replacement of all vacuum elements at once, due to having to remove the dash to access them on a W123.
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84 300SD 350K+ miles ( Blue Belle )
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  #3  
Old 06-19-2019, 08:19 PM
vwnate1's Avatar
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Location: Sunny So. Cal. !
Posts: 4,391
Thumbs up W123 HVAC Vacuum Elements

THANK YOU for the comprehensive listing of P/N's & the picture of which goes where .
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1982 240D creampuff 370,000 miles
1978 300CD back from the dead&1980 300CD ~ SOLD
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1984 Euro 300TD Fully optioned SWMBO's
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  #4  
Old 06-23-2019, 12:49 PM
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Posts: 658
It can also be the vacuum switch. Only way to find out is to apply vacuum to the pod and see if it holds vacuum. If it held vacuum, then it could be the switch or the controller thats not working. If you already removed the dash, I would replace all the pods with new ones. The center vacuum line is also connected to the defrost pod. I glued my center flap open and disabled the switch and plugged the line.
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  #5  
Old 06-23-2019, 12:52 PM
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Rule #1, don't freak out.
 
Join Date: Jul 2017
Location: Seattle, WA
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HAVE FUN!! it is such an insane mess of crap behind that dash!

And you are gonna need a beer when you get it all back together and realize you accidentally disconnected a vacuum line or something and have to start over hahaha
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  #6  
Old 06-23-2019, 01:10 PM
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Join Date: Sep 2013
Location: Alhambra California
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I agree about replacing all of the vacuum pods now that you have the dash out. George Murphy at perfanalysis.com sells new diaphragms for the vacuum pods. They are simple to replace and a lot cheaper than buying all new complete pods. Be careful while removing the pods as the three legs (studs) can snap off easily. A trick that I found that helps while reinstalling the pods is to use a die and carefully thread the three plastic studs on each pod so they can be installed with nuts instead of the push on clips. The push on clips can be a real pain to push on. Vacuum pod number 2 is easier to replace if you remove the center console also.

Last edited by BWhitmore; 06-23-2019 at 01:20 PM.
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  #7  
Old 06-24-2019, 08:17 PM
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-A 116 800 11 75 VAC. ELEMENT FOR CENTRAL NOZZLE AIR FLAP

NO LONGER AVAILABLE .

Help, I want to repair it properly and not prop it open!
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1976 Mercedes 240D (Sold)
1985 Mercedes 300D Turbo Diesel: 500,000KM
1986 Mercedes 300E (Sold)
1988 Mercedes 300E (Sold)
2002 Mercedes C240 (Sold)
2008 Mercedes C350 4matic

A great site for purchasing industrial rubber products!

Industrial Rubber
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  #8  
Old 06-24-2019, 08:30 PM
jhtanglewood's Avatar
Diesel Life
 
Join Date: Apr 2019
Location: Georgia
Posts: 54
How difficult is it to remove the dash?

That's something I've never done but I have the same issue, I'm just too scared to mess with the dash for fear of cracking or breaking something.
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  #9  
Old 06-24-2019, 08:58 PM
ROLLGUY's Avatar
ROLLGUY
 
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Posts: 6,261
Quote:
Originally Posted by jhtanglewood View Post
How difficult is it to remove the dash?

That's something I've never done but I have the same issue, I'm just too scared to mess with the dash for fear of cracking or breaking something.
Actually, removing it is not all that difficult. It is the re-installing that is difficult.
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  #10  
Old 06-24-2019, 09:37 PM
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Join Date: Sep 2013
Location: Alhambra California
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W123 Dash

I wrote a set of instructions for the removal and installation of a W123 dash. It is about 3-4 pages long. Send me your email address and I am glad to send the instructions to anyone.
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  #11  
Old 06-24-2019, 09:40 PM
5cylinder's Avatar
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Join Date: Jun 2006
Posts: 163
Quote:
Originally Posted by jhtanglewood View Post
How difficult is it to remove the dash?

That's something I've never done but I have the same issue, I'm just too scared to mess with the dash for fear of cracking or breaking something.
Having done 3 dashboard removals on 2 late model W123s, my obtained wisdom:
1. Follow the instructions in the Factory Service Manual.
2. Set aside a full day. Stated another way, be in no rush whatsoever.
3. Patience.
4. Take some pictures as the work progresses. Heck, also make a few notes to make life easier.
5. Categorize the experience as learning.
6. Enjoy realizing how capable one actually is.
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  #12  
Old 06-24-2019, 09:42 PM
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Quote:
Originally Posted by marco5 View Post
-A 116 800 11 75 VAC. ELEMENT FOR CENTRAL NOZZLE AIR FLAP

NO LONGER AVAILABLE .

Help, I want to repair it properly and not prop it open!
As of 9:40 p.m. EDT today, M-B is selling 116 800 11 75 "Vacuum Element - Mercedes-Benz". List price $35.00 USD.
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  #13  
Old 06-25-2019, 11:07 AM
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Join Date: Apr 2011
Location: Toronto, Canada
Posts: 269
It's not available, the site just hasn't updated that it is not available yet.

If I ordered it, in a day or two they could come back and say NLA. I've already called multiple dealers.

Any ideas? Can they be repaired?
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1976 Mercedes 240D (Sold)
1985 Mercedes 300D Turbo Diesel: 500,000KM
1986 Mercedes 300E (Sold)
1988 Mercedes 300E (Sold)
2002 Mercedes C240 (Sold)
2008 Mercedes C350 4matic

A great site for purchasing industrial rubber products!

Industrial Rubber
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  #14  
Old 06-25-2019, 11:18 AM
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Join Date: Sep 2013
Location: Alhambra California
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Please see post #6. The vacuum pods can be repaired and George Murphy has the necessary diaphragms.
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  #15  
Old 06-25-2019, 04:28 PM
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ROLLGUY
 
Join Date: Oct 2007
Posts: 6,261
Quote:
Originally Posted by BWhitmore View Post
Please see post #6. The vacuum pods can be repaired and George Murphy has the necessary diaphragms.

http://www.perfanalysis.com/

This is an excellent source for many of the ACC related parts that are needed in these cars.
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