Engine Size: 4.3
Refrigerant Type: R12
Country of Origin: United States
I am getting ready to convert my R4 compressor to a Sanden on my 89 S10, since I cant seem to get an R4 that doesn't leak at the seal. Sanden's seem to say they are for either R134 or R12, but not both. Is there a reason Sanden R134 compressors wont work with R12? Anyone know a Sanden compressor part number to use for this conversion that would have the GM type head, and serpentine pulley so I can use the same hoses as the R4, or will I need to use one with different fittings and have hoses made?
You would need to remove all the PAG oil that might come with a R-134 compressor to use it with R-12. PAG oil chemically reacts with R-12 and becomes sludge. Special adapter sealing washers are available to mate a "stepped" GM block (134a) to a "flat" one (12).
The Air Pro rebuilt Sanden compressor I bought in 2003 from AMA came filled with PAG oil (I tested it). So I drained that out, flushed/turned compressor by hand several times using R-12 type refrigeration oil. Still working in my 1988 Mazda truck, using R-12.
Now about that time, a co-worker bought Air Pro rebuilt compressor for his 1990 Mazda Protege also from AMA, and that one had R-12 oil in it already from rebuilder (we tested it).
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