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#1
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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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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots) 5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others) 5 speed '01 Jetta V6 (new wifes car, pretty quick) 5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k ) 5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest) 0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it) |
#2
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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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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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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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#4
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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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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#5
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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. |
#6
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2000 same problem
Any ideas? Power not being sent from head unit?
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#7
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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
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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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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#9
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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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