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  #1  
Old 08-23-2007, 10:53 PM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
Unhappy C280 A/C sopped working

Dear All,

I was out of town for two months. When I got back and started my car (it started up almost right away). She is a 2000 C280 with climate control. Anyway, I checked and the compressor is running. I could find the low port easily but could not locate the high port within 2 minutes so I could not measure the pressure, but the system does not seem to have lost the freon. Any ideas? Do these compressors have any internal relief valve that could be stuck? Where is the high port?

Thanks,

Greg

__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
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  #2  
Old 08-26-2007, 09:33 AM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
Any ideas?

Any ideas anyone?
__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
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  #3  
Old 08-26-2007, 12:04 PM
Registered User
 
Join Date: Aug 2001
Location: Houston, Texas
Posts: 393
Need pressure readings in this situation. Increased compressor clutch clearance could give an appearance that compressor is working but the clutch really is not fully engaged, but dont know why clearance would change while the car is just sitting. Possible that the expansion valve is not working properly, this is he only other moving part in the system besides the compressor and by not running for a while, due to lack of lubrication, it is stuck in a largely closed position.
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Saumil S. Patel
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  #4  
Old 08-26-2007, 12:14 PM
Registered User
 
Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
http://www.continentalimports.com/ser_ic40142.html

AC actual values and error codes gathered from the CCU is helpful data too.

Your CCU procedures will be very similar to those described in the linked article.
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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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  #5  
Old 08-28-2007, 03:00 PM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
Great info

Thanks - that has helped.

I found a lot of info for E-class, but almost nothing for the C-class. I guess most of the sensors are the same (even though the procedure of getting to the sensor readings is slightly different as you have to pick between sensors with the fan control buttons, and sensor number and reading alternate on the screen), but how about entering the fault code mode? The climate control unit in my c-class does not have the buttons that the E-class unit is using for entering these modes.

Has anyone come across information specific to the C-class climate control?
Would the fact that there is a built-in pressure sensor for the high side explain why there is no physical connector on the high-side?

Thanks for any help!
__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
Reply With Quote
  #6  
Old 08-30-2007, 10:48 AM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
saga continues

When I get the system into the "Collect Sensor Data mode", I get:
1- 88F
2- 84F
3- 87F
5- 89F
6- 196
7- 8'4
8- 98F
9- 33F
10- 125

Unfortunately I do not know how to get it into "Trouble Code" mode. I am also not sure what "9" is above and what unit "7" is in (when it is displayed there is a small circle on the top between 8 and 4. It changes with the engine RPM from about 7'8 to 11'0 (at 4000rpm)).

Any ideas?
__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
Reply With Quote
  #7  
Old 09-01-2007, 10:51 AM
Fixin' anything moving
 
Join Date: Sep 2004
Location: Fort Worth, TX
Posts: 247
I am still not sure what those readings mean...

Thanks!

__________________
1983 560SL Megasquirted (originally 380SL)

My former Mercedes:
1985 300SD ~190k
1990 560SEL
2000 C220 CDI
1983 380SEC 102k dual-chain conversion
2000 C280 70k (sold)
1987 300DT (W124 - sold)
1972 220D (sold)
1971 220D (sold)
Reply With Quote
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