W123 300D A/C Wiring Diagram & Pics?
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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! |
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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! |
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 |
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 |
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 |
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 |
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