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  #1  
Old 06-17-2012, 11:35 PM
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C230 AC Clutch won't engage

Brought the car into an AC shop to fill with freon and/or find leaks. They said they filled it but the clutch wouldn't engage (it did when I brought it there). I checked the clutch and I checked the codes and they all seem ok, including the low pressure. I put a little air pressure into the system untill the pressure code didn't say low and checked the signel going to the clutch and it's at about a tenth of a volt. What else can I check or what else could it be.

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  #2  
Old 06-19-2012, 08:19 AM
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What Year car??

There are several different system depending on the year, some don't have clutches.
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  #3  
Old 06-20-2012, 12:25 AM
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1998

It does have a clutch, and I checked it, disconnected it and put power to it and it engaged, and it measured appropriate resistance, and it worked when I brought it in to the AC shop.
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Old 06-20-2012, 09:32 AM
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On a 1998 the a/c pushbutton sends 12V directly to the clutch.

Have you looked at actual sensor values thru the controller?
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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  #5  
Old 06-21-2012, 03:35 AM
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You mean reading the codes? Yes, I have and they all seem ok.

I also disconnected the clutch and put 12 volts directly on it and it engeged.
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  #6  
Old 06-23-2012, 10:02 PM
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2000 same problem

Any ideas? Power not being sent from head unit?
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  #7  
Old 06-25-2012, 10:43 PM
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I measured it and gave it all the right conditions to engage the clutch and it didn't. I hate to buy a climate control just on the information I have. Is there anything else I can do to tell what the problem is to justify buying anything?
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  #8  
Old 06-26-2012, 08:24 AM
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In the actual value screen, does the evaporator temp sensor have a good reading?

Also is the refrigerant pressure reading in spec, between 3-25 bar?
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  #9  
Old 06-26-2012, 11:32 PM
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The evaporator temperature has a good reading now. I didn't (149) and replaced the sensor and its ok now.

As far as the pressure goes, I can only assume when the AC shop filled it that it was good. I put about 1.5 bar of compressed air into it to get it off its "lo" reading but it didn't engage and I was concerned about putting more in. Would you suggest putting 3 bars of compressed air in and seeing what happens?

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