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Old 05-28-2002, 04:49 PM
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Join Date: Aug 2001
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Question Question for you A/C experts

Is the expansion valve for an R12 system different from one designed for R134? If so, does anybody make one for the 124 model?
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Old 05-28-2002, 05:14 PM
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Join Date: Jun 2000
Location: Plano, TX
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I think all you can find these days are expansion valves labeled R-134a. They look exactly like the R-12 ex. valve, just have a sticker on the side stating R-134a compatibility. My understanding is the newer valves work fine with R-12. I have an R-134a valve in my 124 with R-406a and it cools great. I'd worry more about getting all four connections to seal tightly than whether it's labelled R-12 or R-134a.
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Old 05-28-2002, 05:16 PM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,315
Yes, they are different. I couldn't tell if are looking for the R12 or R134 model, but and you can get the latter from a dealer or Mercedesshop for about $40.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 05-28-2002, 06:04 PM
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I converted over to R134 and the compressor crashed. Put on new compressor and recharged with R134. New dryers on both ocassions. I am about to reinstall the ac after having the engine out and want to get it flushed and recharged. I've heard off debris "clogging" the valve and figured I might as well replace it while I'm at it. I also need to know if there is a 134 pressure switch for the auxillary fan. Mine never worked right after the conversion.
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