Date registered: Feb 2010
Vehicle: 1972 280SEL daily driver. 904 Dark Blue with cognac interior. euro 4.5 engine
Location: Williamsburg, VA
Mentioned: 3 Post(s)
Quoted: 36 Post(s)
W108 AC conversion
I am resigned to the fact that I must retrofit my AC to R-134. My compressor has a bad seal and apparently the PO did a half way conversion meaning nobody wants to touch my car with R-12.
I can not find a source for the original receiver/drier for this car. Everyone says it is no longer made (inlet in top, outlet in bottom, 3/8"flare fittings, 2" OD x 9" long) so I am planning to adapt a drier from a mid 70's vintage 450SEL (is shorter and squatter, but has more volume).
My research has led me to the conclusion that I must do the following: Replace compressor, replace the drier, flush the evap and condenser, inspect expansion valve, replace hoses (mine appear original and I don't trust 40year old barrier hoses), add a high pressure cutout switch in lieu of the superheat switch (which has no purpose with R-134), and recharge with approximatley 90% of original charge using PAG oil (150 viscosity). Also thinking of replacing the 12" aux fan with a larger electric one.
Am I missing anything? Anyone have results of a properly done conversion? I know you will lose some cooling capacity, but it has to be better than what I have which is none.
None of this is hard or expensive, but I really only want to do it once.