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#1
05-25-2007, 03:09 PM
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w124 AC pressures equal across compressor
I just got the report from my Air Conditioning shop. The compressor is spinning away like it should, but the pressures are about 75psi on both sides of the compressor.
Early 1987 300D (sold on the lot in October of 1986) I don't think there has ever been R134a in the system. No records of it and I am contacting the PO now. I had it charged with Freeze 12 last year. I don't know if they also added oil when they added the freon. (I just read about the lack of a sump in the MB set up and the need to add oil when you add freon.) My gut reaction after reading up on the forum is that the compressor siezed and crapped up the condenser and expansion valve. I think I need a flush, a new compressor, condenser, expansion valve, receiver-dryer, and new o-rings all around. The AC guy suggested a new expansion valve to start with and try it from there. Any ideas? -Jim
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1995 S350D, Green with black leather interior. Bought January 2008 w/ 233,xxx miles. I did 22,000 miles during the first year of ownership. 
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#2
05-25-2007, 03:15 PM
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At first thought I'm inclined to think the TXV is actually stuck open.
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#3
05-25-2007, 03:51 PM
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TXV - Thermal eXpansion Valve (aka expansion valve)?
That was what my AC guy suggested. -Jim
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1995 S350D, Green with black leather interior. Bought January 2008 w/ 233,xxx miles. I did 22,000 miles during the first year of ownership.
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#4
06-25-2007, 02:25 PM
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OK, it wasn't the expansion valve. I changed it and the receiver dryer. It was not holding a good vacuum. (Lost 7psi in 15 minutes.) He shot soaped everything up and shot some freon to it. Everything looked great from above. From below there was oil and bubble coming from the clutch side of the compressor. Looks like I need a new compressor.
Any suggestions on where to find one? When I try to look it up it askes which engine I have: 12-023875 or the 12-023876 I have a 1987 300D. I don't have the VIN handy right now, but it was sold in October of 1986, so it is an early model. -Jim
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1995 S350D, Green with black leather interior. Bought January 2008 w/ 233,xxx miles. I did 22,000 miles during the first year of ownership.
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#5
06-26-2007, 10:31 AM
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I just replaced the compressor on my 89 300E last weekend and I buy virtually all of my parts from The Benz Bin. I paid $342 approx. and I could store meat in the car now ! I have never gotten a bad part from the bin and just placed another order today.
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#6
06-26-2007, 10:59 AM
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I've had the best luck w/ Benz reman compressors. Some of the aftermarket bits didn't hold up well..
Just my 2! Jonathan
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Blue Ridge Mercedes Jonathan Hodgman http://www.blueridgemb.com/ Enthusiast Service, Restoration & Tuning. Follow Us on Facebook! Located in the Atlanta area Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines. Mercedes Repair Atlanta
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#7
06-26-2007, 11:53 AM
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Quote:
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 1993 190E 2.3 2001 SLK230 1971 LS5 (454) Corvette Convertible
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#8
06-26-2007, 12:14 PM
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Could it really be that simple? Are they the seals that are included in the o-ring kit? (Rectangular, segmented seals)
-Jim
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1995 S350D, Green with black leather interior. Bought January 2008 w/ 233,xxx miles. I did 22,000 miles during the first year of ownership.
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