A/Coff switch
I am a little embarrassed to ask a question like the following but I think Germans have their way to be different. First their weather channel shows the oceans and seas on the globe imagery with the color of the land, and the land is shown with the color of the oceans. Second, the cruise control in the cluster illuminates from the highest speed point and on NOT illuminate the area from 0 to 70 for example.
Now the embarrassing question is that after replacing the compressor the a/c barely blow 10% cold air and that is when I turn the switch off (the red light is off on the switch and not visible). When the switch A/C off, the red light is off, Does that mean the A/C is on? confusing!!!
Last edited by alexqkama; Feb 26, 2016 at 05:51 PM.




So not having confirmation what model of car you have, we can read crystal ball and that is about it.
AC on MB is confusing. In previous years MB did not have AC on/off switch, but it did have "Economy" switch what did exactly opposite to what AC switch would do.
So how about a picture of what you have?
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Sure German are strange people. They drive in kilometers, read temperature in C, buy fuel by liters, beer by kegs and 180 kph is slow lane speed.
It's a 2003 E320 in Dallas/Fort Worth that's been through a flood, if his posts and avatar sig are to be taken seriously. My WAG is that electronics don't like to be flooded, his is having issues because of it, and his "general mechanic" is as over his head with this car as the water was over the Benz. But I could be mistaken, and I welcome being enlightened by the OP...

alexqkama, here's the owner's manual for your car; it might help with your questions:
http://www.mbusa.com/mercedes/servic...&class=E-Class
Last edited by rapidoxidation; Feb 26, 2016 at 11:10 PM.
The car is flood car and I have replaced many modules. everything works except the AM radio, the RF remote and draw in the battery.
I'm just learning about these cars myself, so take what I'm about to type as words from a n00b: There's a battery control module in the trunk, just below the floor. If my limited understanding of the module is correct, it supplies the charge current to the main and to the auxiliary (brake system) battery while at the same time keeping them isolated from one another. If you've got issues with a battery getting pulled down, maybe start there.
The more I learn about these cars, the more I'm sure that getting the proper diagnostic computer is essential to be able to accurately figure out what is happening. STAR tools are available on Ebay for less than $1,000. if your mechanic doesn't have something very comparable, you're just tossing money away...
Hopefully someone with more knowledge and experience will pipe up in this thread, but I suspect that the flooding, even if it was only up to the seat cushions, will be a serious issue for the car as long as you (or anyone else) owns it. If something isn't cooked immediately, then corrosion is the ticking time bomb.




Just last week we've got first DIY on SBC pump replacement.
Took 13 years....
AC on those cars has its own program as well. The compressor will come on even in freezing temperatures to prevent glass fogging and the truth is that MB is not disclosing the programs, so we have to do it hard way.
I let the automatic climate control do its magic on W123. The car come on the road over 30 years ago...
On W211 I am fortunate to have climatronic with my 4-zone, so I can troubleshoot sensors while driving, but guys with no LCD have to do it the hard way.
So getting SD from ebay might be just the begging of very hard and long journey.
Did I mention that SD have advanced options in German?


