I've spent the last hour using the search feature, hoping to get a better understanding of the cryptic climate control buttons on my '84 300TD wagon.

I bought the wagon with no belt on the A/C compressor, no pressure in the lines and a blower with worn out brushes. I am in the middle of sorting all that out, but I still don't have an understanding of the basic controls.
I should have the blower working in a few days once my replacement brushes have arrived, and I hope to start diagnosing the A/C system soon after the blower blows.

However, the enigmatic climate controls remain a mystery to me.
Can anyone please help me find a picture guide to what the buttons are supposed to do?

Many thanks!
-steve

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1984 300TD wagon with heated dual-tank WVO.

The owner's manual has a detailed description of the climate control system; as I no longer own a 123, I can't post pictures. You might be able to find the owner's manual in pdf somewhere in the forum or elsewhere on the web or (heaven forbid!) actually buy a copy on eBay or books4cars.com.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Climate Control:
Climate Control:

Here's a pic and more info is in this thread: 240D Two Middle Vents

Attached Thumbnails

 

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83 SD

84 CD

What they were meant to do... and what they actually do may be different...
My 81 wagon buttons took my pushing them as only the mildest of suggestions... might work 20 minutes and quit.. might not do that at all.... might do it a while and then quit...
the diagnostic on the stuff behind that row of buttons is about 80 pages long.... a big reason that I sold my 81 and got the 240 with the manual type one AC in it..

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

^ This is true, the CCU or rather ACC, the push button unit itself, is a high failure item, leading to all sorts of frustration.

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83 SD

84 CD

If the PB control unit acts up, just buy a rebuilt one from these guys:

http://gdl-online.com/price6.html