W124. I did it myself -- flushed the condenser and emptied the compressor, refilled with 6 oz of PAG 46 per the Nippondenso recommended oil. Had been "converted" before by dumping in some ester oil, I suspect, and screwing on a conversion fitting, but only on the low side.
Since I was replacing a bad compressor, I changed all the o-rings except the ones on the expansion valve as it was holding pressure just fine and working well so long as the compressor would stay on, but if you are doing this job under reasonable time constraints rather than attempting to get a car on the road for a trip in limited time, I would also change those and flush the evaporator with commercial flush solvent. An amazing amount of crud blew out of the condenser -- the expected "aluminum paint", but also a big slug of brown slops, so I expect I have good performance due to a clean condenser (which, for those who advocate new parallel flow units, IS a parallel flow condenser). Use only a proper flush solution, not some available solvent like brake parts cleaner (hexane and dry isopropyl alcohol will work, but the commercial ones are better). You can also replace the expansion valve with one from the years where R134a was stock -- I believe they are slightly different, with the later one giving better slow speed performance than the one for R12. And, if you are going to all this effort, get a new shaft seal and mainfold o-rings for the compressor. Doesn't take long to replace them, and you will have essentially a new system. Do NOT use green o-rings from an assortment for the manifold seals, inner or outer -- the proper ones are black rubber and don't fit like you would expect (they have to be forced into the recess, they don't fit loose). Yeah, they cost $4 and something each, but the green ones I found on my brother's SDL compressor (now happy in my 300D) were flattened, hard, and showed signs of erosion from escaping hot gasses..... Peter _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
