I'm fixing an AC problem in my sons 85 300D. His AC goes full heat at times even while off. We have replaced the mono valve with the one out of the 300TD. But of course it could have ripped. I am assuming it is the temperature control circuit box but of course we will check the mono valve again as well as the wiring.
I have the Service Manual CD for the W123 I do not have the paper manual for the W123 climate control. The electrical schematic diagrams of the AC circuit in job 83-600 are not very clear.
Could someone who has the paper manual take a picture of the USA electrical schematic on page 83.6-600/13 for me. Just the schematic and at a high resolution.
Please E mail it to davidwmorrison@gmail.com

Thanks

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car

Email sent.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

I have the PDF file at home on a CD, sent to me several years ago from another forum user, covering the missing files on early issue CD service manuals regarding Type I, II and III AC. It's several megs, too large to post here.
Do you want a copy of the file? I could send it in the mail.
Alan

Full heat all times sounds like the printed circuit board is toast. A seized aux water pump will overload the board. This problem can be avoided by splicing a 1 amp fuse into your black (hot) wire at the pump.

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DO IT RIGHT THE FIRST TIME, DON'T BE A HACK
Political Correctness is NOT part of my vocabulary
and finally FIGHT CRIME...SHOOT BACK

'82 240D Stick
'85 300D Auto
Drove my first MB at age 16 1960 300SL W190

Is there a way to post the electrical diagrams to this forum, like PhantomS did for the vacuum diagrams? The pdfs in the Service CDs are just awful - absolutely no detail, worthless for the W123s. Otherwise I would greatly appreciate an email with these files so I could test/troubleshoot my system. ('84 300D, 320Kmiles) micalk@sbcglobal.net