Diesel Discussions Only diesel topics should be posted here.

W123 300D A/C Wiring Diagram & Pics?

  #1  
Old 07-13-2015, 03:29 PM
handygeek's Avatar
Member
Thread Starter
Join Date: May 2015
Posts: 31
Default W123 300D A/C Wiring Diagram & Pics?

Mods: Please delete my older post here: https://mercedesforum.com/forum/dies...details-55914/

NEW POST:

I need help with the wiring for the A/C system, please?

It's blistering hot here & we're stopped dead in the process of fixing the A/C without some information.

1983 300D-Turbo

I've included a console picture in case it helps to ID the type of wiring.

Sure appreciate anything anyone can share ... thanks!
 
Attached Thumbnails W123 300D A/C Wiring Diagram & Pics?-consolecontrols1-sm1.jpg  

Last edited by handygeek; 07-21-2015 at 04:16 PM.
  #2  
Old 07-20-2015, 03:47 PM
handygeek's Avatar
Member
Thread Starter
Join Date: May 2015
Posts: 31
Default

This YouTube video helped with getting at the switches:

https://www.youtube.com/watch?v=lCUdGjhr0E4


Once inside the console everything appears intact.

In the engine compartment - are just the two wires to the compressor everything needed?

There's a second insulated run with two wires that runs down near the compressor, to which a prior owner added some wire, but it's not apparent to what that may belong.

There is no break in the wires to the compressor - though the connector seems to float a but - is that normal - or does it suggest a potential problem?

Thanks!
 
Attached Thumbnails W123 300D A/C Wiring Diagram & Pics?-accompressor-wire1-zoom1-cp1.jpg   W123 300D A/C Wiring Diagram & Pics?-accompressor-wire2-sm1-cp1.jpg  
  #3  
Old 08-04-2015, 05:36 PM
handygeek's Avatar
Member
Thread Starter
Join Date: May 2015
Posts: 31
Default

OK, finally got back to this ...

Unplugged at compressor and Ohm meter shows a change when the hot/cold wheel is turned on the console & also when the left most button - defroster - is pressed.

Next, with the car running the voltage reading is only a trace at.0049 but it does vary when the hot/cold wheel is turned (suggesting that the level-control rheostat is working).

Where best to start looking for the cause of 12v not getting to the compressor connector, please?

Lacking a wiring diagram & pics it's unclear if I'm tracing to a relay at some unknown location or to a fuse somewhere.

Thanks - David
 
  #4  
Old 08-15-2015, 10:17 AM
handygeek's Avatar
Member
Thread Starter
Join Date: May 2015
Posts: 31
Default

Here is about everything I needed ... Searching can be an art - finding stuff often depends on how one asks the question.

Compressor Relay in 83 300D Turbo??? - Mercedes-Benz Forum
 
  #5  
Old 08-15-2015, 06:07 PM
handygeek's Avatar
Member
Thread Starter
Join Date: May 2015
Posts: 31
Default

I just tried to read that diagram & it's not easy.

Anyone have a better scan, please?

Preferably something I can print full page - not that my eyes are aging or anything ...

We may finally get this thing fixed - and before the hot weather has passed.

Thanks - David
 
  #6  
Old 08-18-2015, 10:17 AM
handygeek's Avatar
Member
Thread Starter
Join Date: May 2015
Posts: 31
Default

Can someone suggest a place that I can get the needed diagram?

Why is such a piece of critical data such a pain to locate?

It's so frustrating to be unable to troubleshoot for lack of simple documentation.

Sigh ... thanks ... David
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
felix halim
New Mercedes Benz Forum Members Area
0
08-28-2010 04:42 AM
allday913
Diesel Discussions
0
06-26-2010 05:05 PM
SL600_Cruzin
Mercedes C Class
6
01-18-2009 03:56 PM
sleepwalker
Mercedes S Class
3
03-24-2007 11:47 PM
sowah1
General Tech
0
08-19-2003 10:31 AM


Thread Tools
Search this Thread
Quick Reply: W123 300D A/C Wiring Diagram & Pics?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.