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Old 06-30-2001, 03:16 PM
Join Date: Jan 2000
Location: Maryland. USA
Posts: 180
Converting a R-12, York compressor F210R based system to 134. 1986 Mercedes 280 G-Wagen. It was operating GREAT until something punctured the condensor (in repair right now). I plan to:
- Flush all lines, condensor and evaporator
- R&R all O-rings with correct material o-rings
- Draw a deep vacuum using a Yellow Jacket 4cfm for a long time. I'll be using a "real" set of gauges.
- Use Poly Alpha oil (ROC AA1 ISO Viscosity Grade 68) from AC Source
- New receiver/dryer
- New York (CCI) compressor (the old one had leaky seals so its headed for new seals and my 1981 Volvo (different head plate though))
- I've read just about everything I can get my hands on on this subject. But I'm still listening

- If the performance is not acceptable with 134 and I want to return to R12, will I need to flush out the Poly Alpha? From what I can determine the answer is no?
- Where is a really good ambient Temp to pressure table for 134?
- I've read that 75% of the R-12 weight is a good place to start. Any differing opinions.
- I've seen some technical discussion regarding the oil viscosity and amount. PolyAlpha is a darn light synthetic oil at ISO 68 so that is good. Yorks operate at a wide varity of oil levels, 6 to 16 ounces per their operating manual, but in those discussions I noted that several were saying the too much oil can markedly reduce heat transfer efficiency. Any suggestions from you all on the number of ounces?
- Does anybody know where I can have a RCVR/Dryer cut open and have the newer desiccant installed. The price of a new R/D for a G-Wagen is 10 times the nominal charge.

S, J.R. Brown
2000 G500 LWB Obsedian Black
2005 Toyota Tacoma Access Cab Off Road Sport
1993 Volvo 240 Sedan Anthracite
1980 450SEL Champange (owned it for 15 years. Great car)
1986 280GE LWB Anthracite (Sold it and kinda wish I hadn't)
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