I have a MB E220cdi -99 stw and the EC is always on.
Since I suspected that there was a lack of refrigerant I took the car to a shop and they run a test but everything seemed ok, they suggested that there was som electrical problems.
I have now checked out following info from the clima display:
05 Evaporator temp 38 C
06 Engine coolant temp 77 C
07 Refrigerant pressure 04
08 Refrigerant temp 15 C
12 Sun sensor 2,6
I also picked up following errorcodes:
416 Coolant circulation pump
231 ECT sensor
234 Sun sensor
459 Series Interface (k2) connection to instrument cluster (a1)
422 Series Interface (k1) connection to intrument cluster (a1)
424 Activated charcoal filter actuator open
241 Refrigerant fill
But since the car has been used as a taxi prior to when I bought it, and they have replaced at least the engine and the climate control display, I suspect that maybe some of the errorcodes are old, since the ECT and the climate control display (which I assume is related to the errorcode 459,422) seems to work fine.
Questions
1. Does a refrigerant pressure at 04 mean 0.4 or 4 bar?
2. Is there something that has to be reset due to the engine replacement?
3. Does anyone have had the same problem and share the solutions of these?
4. Does anyone know how to reset the errorcodes without a scanner tool.
5. Does anyone know the pin configuration at the 38 pin diagnostic connector.
Would appreciate anything that could be related to above, thanks.
You know... this is a pretty common problem and usually is easy to fix. But I can't remember exactly the problem. I think it is the sensor that measures the air temperature off the evaporator. From reading the climate control operation theory, if the temperature difference is too high or too low it will not allow the compressor to run.
38 seems pretty high for the temperature of the evaporator!
Do some more searching on the web or on mercedesshop.com ... I am sure I read a lot about it somewhere.
ignition in position 2, left temp on hi, right on lo, within 20 seconds,press rest and ec @ the same time for at least 5 seconds.the auto button should go thru the codes. to erase, press up and down @ the same time. pretty sure it should work...
The readouts from your HVAC computer diagnostics indicate that you have a problem with the refrigerant temperature sensor. MB issued a technical bulletin about it a couple of years ago and this is a fairly common problem with the W210 air conditioner. It seems to be occuring more often in 96-98 models, may have to do with age or use. The sensor accumulates moisture which causes it to fail and in turn lights the ECC light and the air conditioning will not work. This sensor is located under the dash on the side of the AC unit and not too hard to replace. Because of some arthritis problems I was unable to get under the dash and had to take it to the shop and am not sure where the sensor is precisely.
I have replaced the evaporator temp sensor (part# 210 830 05 72)and reconfigured the climate display unit due to the Mercedes bullentin recommendations, which was posted by Sokoloff, and yes it works fine!
Linear Mode
