Well, I changed all the fuses and no change in power windows or ACC.

With full vacuum (enough to shut the car off, don't know if leak would effect this) I cannot hear any movement in the ACC when i switch to different modes.

I guess the next step re: the power windows and ACC is to open up the console and take a look and see if they are getting power....

On the plus side, while looking at the grounds behind the instument cluster I changed the dash light rheostat thing and have dash lights for the first time in a few years! (very easy if you haven't tried it, been putting it off for a long time..)

small steps....

Merry Xmas

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1983 300 D

And Merry Christmas to all from snowy but bright and sunny Salt Lake City.

The ACC pushbutton thingy is easy to remove. The wood cover is simply held on by four plastic snaps. Pry carefully and it will pop off. Next, remove the two Phillips flat-head screws in the upper corners of the pushbutton module. That releases the top of the module.

The bottom is held in by fingers molded into the plastic. You must lift the module up while carefully pulling the top towards you (for clearance) until the fingers pop out at the bottom. I found that I could use a flat-bladed screwdriver in one of the slots in the plastic panel of the ACC.

Once the ACC pops free, you can pull it out of the dash enough to see the cables on each side and the string of lamp wiring. Unfortunately, I don't know which pin on which of the two cables delivers power to the ACC. It may in fact be getting power but simply not working. It's strange that the defrost mode (at least) does not work. Mercedes designed it to be the last to fail since almost nothing needs to work for defrost to operate.

Have you tested the blower yet?

Jeremy

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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

I have not tested the blower, but it is not getting power, so I took out the ACC. The ACC was getting power on a few different pins, so I opened up the back and it looks burned in a few places. See Photo. Is that what it looks like when its fried?

Attached Thumbnails

 

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1983 300 D

That doesn't look good, but don't know if that's your problem. An expensive swap out. The solders appear to be OK, I was going to mention to check those. That unit has a high failure rate.

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83 SD

84 CD

that doesnt look good, but not terrible, either- do you see any obviuos cracks on the board, or bad solder joints??

Have you checked out your aux water pump? blower brushes? temp air tube behind dash?

heres mine-just pulled it out as it was spewing a bit o' magic smoke yesterday- I dont know if it will still work or not, but nothing seems ruined. a bit of discoloration. not as bad as yours, though.
I have a few loose ends to tie up before I re-install. if it doesnt work, I am going to put in a toggle for the fan and rig up defrost, at the least.



Hers a bad one, came in my 300D

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.