The old type ACC with the evil servo existed up until 80 or 81. The later 300D\s have a less evil type of ACC without a servo.

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Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

US-market 300D through 1980 had automatic climate control, using a Chrysler-designed electro-mechanical coolant valve and mode-control servo mounted underhood, ahead of the right wheel housing. I believe '81 and later 300D used an all-electronic automatic climate control that's supposed to be more reliable.
Personally, I prefer the manual heat/AC setup used in Euro models, and my 240Ds.

Happy Motoring, Mark

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DrDKW

Ok thanks for the info ?

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1985 300D : the clean one 180k miles - Now passed onto my parents.
2000 E39 M5
2002 e46 330xit
1991 mustang notch (project)
1970 chevelle (project)

Both your's do. Transition year on W123 300D and 300TD was 1980. My 1980 wagon had ACC [horizontal buttons]. Most '80 and prior 300D sedans have the evil servo [vertical buttons].

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John