Thanks for reading. I appreciate any help you could offer. We have a european 1986 190d with 2.0L that we are attempting to repair the air conditioning in. I have the european air conditioning with sliding temperature control (NOT the pushbutton tempmatic from the USA).

I desperately need a wiring diagram for this climate control system as someone has spliced and disconnected wiring to the sliding temp control switch and we're trying to repair it.

It would also be very helpful if someone could tell us how the air conditioning compressor/ac operation is turned on and off. We have wired the new sliding switch, but the AC compressor cycles constantly in all positions of the sliding temp control....

For example, if you want to turn on your euro AC do you simply slide the sliding temp control to the right? Or is there another switch which must be engaged to turn on the sliding temperature control and turn on the AC operation?

Please post/email any info you might have that may help us. Thanks in advance- John

satyr7777@aol.com

Hello satyr,

No answers untill now?
I am living in Europ and own and drive a W 124.193. That meens a wagon with a 603 - 3.0 l turbo Diesel.
It is equiped with a manual airco to. I don't know the working of your system but mine is adjusted by two wheels. One for the right side and one for the left. To engage the compressor, I have to turn one of the wheels to maximum cold. Just before the stop I can feel/hear a switch clicking. Choosing a temp higher will only engage the comp in function of the requested temp/outside temp. I am wondering if you can hear that click to when sliding your selector?
A good friend of mine is my indy and a very competent independant MB specialist especially for older MB's.
If you want I will ask hem for a wiring diagram (if he has one).
Beware : a cycling AC compressor meens there is not enough refrigerant in the system! There are tons of information on this forum about this toppic so did you do a search? That would at least partly answer some of your questions.
As my indy don't speak/read or write any English, I will act as your inbetween if necesarry. Just let me know.
Good luck!

Danny

Thanks for the post Danny!

I managed to get a wiring diagram from a nice guy on a 190 web site in the UK. That helped ALOT! Your info helps too. After wiring the switch the compressor would come-on no matter what the setting was on the "sliding temp sensor." It looks as if the switch was wired improperly by whoever worked on the switch before. I haven't heard from my mechanic yet today, but I'm hoping that the schematic I gave him helps straighten out the problem.

I also was told that euro AC's are turned on by moving the temperature slide control up from it's lowest point, and to shut it off, you set it at it's lowest setting. It would be on a "vent" or no ac setting at the lowest point on the slide control. If that is true for your car too- then this is how mine must be configured as well. If mine doesn't work that way- we're just going to put an on-off toggle switch in it and "call it a day."

I'll check with the mechanic about the freon pressure thing too- thanks- John

Hello John,

Sorry that I am so late to respond. Our server crashed itself so I was without Internet untill now!
I am glad your problem will be solved. Once someone gets used to an A/C in a car, it's hard without one. Not only for comfort but I find it a real safety issue.
It keeps your head cool and your attention awakened. Not a luxury in the more than dense traffic over here...
Best regards,

Danny