W126 Heater, Vents, EC, dash rebuild - Mercedes-Benz Forum
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post #1 of 15 (permalink) Old 01-19-2015, 08:53 PM Thread Starter
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W126 Heater, Vents, EC, dash rebuild

Short; Once committed to opening the dash, rebuild everything underneath.

After many searches and pouring over websites, I cannot find a guide to rebuilding a 300SD, (1983) dash, vents, heater, blower, mono-vavle, vacuum actuators in one concise place. Just bits and pieces. Even Kent (The Guy) doesn't have a Guide...yet... Help?

Thanks to this forum and Kent's ...Source, The engine and turbo are great and the tranny shifts like a ....well, Benz!

So on to Creature Comforts (the Girl wants heat....)

Removing the dash and rebuilding everything underneath is the general goal.

Once I'm into an area, I like to spend lots of Zen Time and fix everything in the area and clean/refinish as I go.....

my own situation: '83 and 82 300sd:
The vacuum line from the engine pump shows a leak.
The EC Control seems to be conscious and working, but no doors move.
The front vents, center left and right do NOTHING as far as airflow goes.
Heater blows only slightly warm air , and not in any specific direction.

So I think taking it ALL apart and giving it the replace/rebuild/refinish/polish everything treatment should get it all working again.
The AC...well, THAT's another Story and is Out of Scope, me thinks, in this Thread.

With your collective Input, this thread might grow into a sectioned Heater and Vents Restoration Guide:

Section #1: Remove Glove Box - don't you hate a crooked Glove Box!?
Glove Box Removal: Gets you into the vent section of the dash. not tested or photographed yet
1) Pry glove box light out and disconnect wire.
2) Gently pry upper half of the plastic rivet to release it.
3) Remove the lower half of that rivet.
4) Remove glove box. (installation is reversed)



2) Remove Center Console - fragile plastic does NOT like guessing here.
3) Remove Dash - going ON is tougher than getting it off?
4) Rebuild MonoValve
4.5) Flush Heater Core
5) Rebuild Bower with brushes and bearings.
6) Test Vacuum Actuators and replace
7) replace all Vac hoses
8)Good air flow to passenger doors through the permeable leather (true Benz)
9) Rear Passenger Heat and controls
10) test before reassembly

HELP?

Much Thanks in keeping our 'Ol Ladies beautiful!


"Rear passenger heat" are the floor ducts under the front seats. Some think the fresh air vents at the rear of the console transfer heat. They only send outside air, so shut those during cold weather.

Programa Main Page.
ProgRama Remanufactured Electronic Control Modules 2-3 YEAR warranty

W126 CCU Page.
Professionally remanufactured parts with extended warranty

Rebuild all of the vacuum pods even if they hold a vacuum. Cheap insurance while everything is apart. Purchase the rebuild kits and special tool to rebuild them from George Murphy at Performance Analysis Co. Phone number see thread

sealing foam on all the doors/flaps. Possibly Oven Door Sealing like Grainger Item # 21VM85? What diameter?

MORE TO COME!! 20Jan2015

Last edited by 300SD_Dreamer; 01-21-2015 at 07:00 PM. Reason: additional Info from Members
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post #2 of 15 (permalink) Old 01-19-2015, 09:44 PM
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"Rear passenger heat" I presume you mean the floor ducts under the front seats? Some think the fresh air vents at the rear of the console transfer heat. They only send outside air.
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post #3 of 15 (permalink) Old 01-20-2015, 12:59 AM
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Yes on your climate version you have only non heated air to the central rear vent, so that just needs to be shut during cold weather.

Removing the dash is actually bizarrely easy. I've never refitted one though - yet :-)
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post #4 of 15 (permalink) Old 01-20-2015, 05:42 AM
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and should you require any bits like duct work for a non airbag W126, I have the complete dash, complete heater box and all the ductwork from an 87 SEC.


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post #5 of 15 (permalink) Old 01-20-2015, 10:15 AM
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I will be following this closely as I would like to tackle the same project and add in the swapping in of a new updated AC compressor kit and a rebuilt CCU from Prgrama in Florida.

Programa Main Page.
ProgRama Remanufactured Electronic Control Modules 2-3 YEAR warranty

W126 CCU Page.
Professionally remanufactured parts with extended warranty

Rebuild all of the vacuum pods even if they hold a vacuum. Cheap insurance while everything is apart. Purchase the rebuild kits and speacial tool to rebuild them from George Murphy at Performance Analysis Co. Phone number 865-482-9175.

Replace all of the sealing foam on all the doors/flaps on the heater. Not sure what type of material to use that will not deteriorate after a bit of time. Advice???
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post #6 of 15 (permalink) Old 01-20-2015, 12:35 PM
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Hello 300SD,

Send me a PM. I have a rather lengthy but not finished yet document covering the removal of the dash and rebuilding of the HVAC system on my 1981 300SD. I got stalled with the document about 8 months ago when it was about 80% complete and lost my momentum.

I can use you as a 'proof reader' to see if the text and pictures do what I intended them to do. The document is too large to attach due to my forum account limitations. Hence the PM method.

I'm on the other side of the Atlantic so my response time will be delayed.

Thanks and take care,
PK
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post #7 of 15 (permalink) Old 01-20-2015, 05:55 PM
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This has the potential of being a great thread!
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post #8 of 15 (permalink) Old 01-20-2015, 07:19 PM Thread Starter
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GREAT Input so far!! 20Jan2015.
I put the info above into the first Post using "EDIT" for easier reference.
I hope to review Mahone Bay's document soon.

So can I infer that putting the dash back ON, is a luck-shot?
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post #9 of 15 (permalink) Old 01-21-2015, 10:17 AM
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Smile Interested dash

Quote:
Originally Posted by 281lxm View Post
and should you require any bits like duct work for a non airbag W126, I have the complete dash, complete heater box and all the ductwork from an 87 SEC.
Hello,
I'm wondering what color the dash pad you have is and the under dash carpeted knee panels are. Thanks very much.
Dave.
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post #10 of 15 (permalink) Old 01-21-2015, 10:18 AM
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The dash has some cracks and is the standard blue/black. The rest of the stuff is 268 grey


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1991 560SEC 199 /268, 17" RS90'S, Eibach springs, Bilstein HD shocks, Custom rear sway bar, Euro Headlights, Custom ceramic coated headers and down pipes with stainless dual exhaust, W140 glass sunroof, dog ear trunk spoiler, OEM Skid Plate, Euro bumpers, wood refinish and restored.
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