A/C compressor problem... - Mercedes-Benz Forum
 
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post #1 of 8 (permalink) Old 05-22-2019, 07:54 PM Thread Starter
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A/C compressor problem...

I don't know if this is a dumb question or not ...BUT is there a control module or relay that powers up the AC compressor? I recharged the system (just like I've done every summer for the past three years) but the compressor isn't kicking in....nor are the aux fans. As far as I can tell, I'm not getting power to them OR the compressor itself..

Is the entire AC system operation in the climate control head in the dash or is there are separate relay/module/fuse somewhere I can't seem to locate?

Please get back to me before it gets really "summery." Thanks in advance, guys!

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post #2 of 8 (permalink) Old 05-22-2019, 08:26 PM
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Scan for error codes in the climate control.

Turn the ignition on. Put the driver side to HI and passenger side to LO. Then press and hold the EC button and the REST button at the same time and wait for the screen to change. You have to do this within 15 seconds of turning the ignition on, otherwise the screen won't change.

After the screen changes you will see eb1 on the left and a number on the right. Press the Auto button to scroll through all the error codes. After you scrolled through all codes you need to erase them, do this by pressing both AUTO buttons at the same time. The screen should then show e FF. Turn the ignition off and back on again and re-scanning for codes.

Post the codes that you see during the first test and then post the codes that show up again (if any) during the second test.
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post #3 of 8 (permalink) Old 05-23-2019, 09:20 AM
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Originally Posted by Doni View Post
I don't know if this is a dumb question or not ...BUT is there a control module or relay that powers up the AC compressor? I recharged the system (just like I've done every summer for the past three years) but the compressor isn't kicking in....nor are the aux fans. As far as I can tell, I'm not getting power to them OR the compressor itself..

Is the entire AC system operation in the climate control head in the dash or is there are separate relay/module/fuse somewhere I can't seem to locate?

Please get back to me before it gets really "summery." Thanks in advance, guys!
To answer your question, no, there is no compressor relay that switches the compressor on and off per cooling demand (old design). The compressor is controlled by the head unit (the controller), and it is turned on whenever the EC button LED is not "red". It is supposed to run continuously.

What was the cooling condition before you recharged the system ? partially cooling ? or not cooling at all ?

Obviously, the compressor was running when you were recharging, else it would be very hard to "feed" the refrigerant.

Look for the fault codes and clear them as described.

How much refrigerant did you put into the system ?
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post #4 of 8 (permalink) Old 05-23-2019, 09:48 AM
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In the time you spend on starting forum topic, you could do proper troubleshooting.
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post #5 of 8 (permalink) Old 06-05-2019, 06:44 AM Thread Starter
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Scan for error codes in the climate control.

Post the codes that you see during the first test and then post the codes that show up again (if any) during the second test.
Okay.....I think I did this right. The "codes" I noted are as follows:

231
232
233
234
235
422
459

I also pulled down quite a few secondary numbers but I don't know if they're "trouble codes" or system reading/levels.

1-91
2-73
3-107
4-109
5-147
6-152
7-00
8-75
9-27
10-0.8
11-2.6
12-3.7
20-3.2
21-32
22-00
23-32
24-11.6
40-164
41-32
42-76
43-152

I've been driving my W140 lately so the W210's AC hasn't been an issue ....but I would like to get it working again just in case I need the car on a hot day.

Thanks in advance for any guidance you guys can give me!!

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post #6 of 8 (permalink) Old 06-05-2019, 07:26 AM
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reset each code from the diagnostic menu, by pressing both auto keys .

see the instructions in STEP 9 of the attached.


STAR TekInfo

Then come back and re-post the codes that do not clear.

You have no refrigerant in the system (at least that is what the second set of figures say). Then again you have a refrigerant pressure sensor fault. After clearing the codes, do the sensor tests again (second set of tests).

Your evap. core temp seems to be a bit out of wack. Not even good enough for Magrathea
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post #7 of 8 (permalink) Old 06-05-2019, 03:53 PM Thread Starter
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LOL!!

Okay, Zaphod. I’ll run them again!

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post #8 of 8 (permalink) Old 06-05-2019, 04:11 PM
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LOL!!

Okay, Zaphod. Iíll run them again!
I believe Trump has been called that
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