My E320 was stuck in EC mode (light on) and thus could not get AC to work.
I found several related topics explaining how to obtain the on-board diagnosis codes via N22 control module on benzworld.com and mercedesshop.com forums as well as http://www.continentalimports.com/ser_ic40142.html and http://www.eclassbenz.com/acdiag

01: 98 in-car temp
02: 76 outside temp
03: 69 heater-core temp left
04: 69 heater-core temp right
05: 73 evaporator temp sensor
06: 66 ECT sensor
07: 04 refrigerant pressure
08: 67 refrigerant temp sensor

I also got the following Faulty codes:

EB1419 electromagnetic clutch
EB1234 sun sensor (safe to ignore based on read articles)

I then followed the instructions posted by Sokoloff (MB bulletin 37/99-2) and could turn off the EC mode:
210 chassis climate control problem

I have not yet replaced the evaporator nor the refrigerant temperature sensor at this point. My AC is still not blowing cold air though.

The faulty electromagnetic clutch code EB1419 does not sound like a simple problem to me. So, before replacing any unnecessary parts, just wonder if any MB tech gurus here can point me to the right direction?

Appreciate much your inputs...
John

__________________
Tigger - 2001 E320

check to see if low of freon and if not check ac preasure switch

need to try and clear codes after repair sometime ac will not kick on

Thanks. Is it something I can do to clear the codes or gotta take it to dealer?

__________________
Tigger - 2001 E320

Read stevebfl's article again. You can clear codes from the display.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

Terry,
Would you mind provide a link or thread ID? I searched and Stevebfl has posted like 500 threads total!

__________________
Tigger - 2001 E320

You need to check the clutch. Ensure that it has continuity by disconnecting the lead and checking the resistance to ground. Also ensure that you can turn the compressor input shaft by hand.