Converting a Series III Air-conditioner to R134a
In servicing my recently acquired 1982 Series III XJ6, I noticed the
Air-conditioning compressor (GM Harrison A-6) was throwing oil thru the
front seal (although it still worked great.) Hot weather coming on, I
found a replacement at Western Auto (Parts America) for $59.95 with core
exchange. A friend of mine is liscensed for R12 removal and has the
equipment. He drained my system, and me and my dad went to work.
We removed the compressor and replaced it with a remanufactured GM A-6
designed for the temperature/heat fuse. (Please note I had no leaks on
the system.) We changed the accumulator/dryer-and changed only the
o-rings we had disturbed. (Some techs say you must replace all the
o-rings in the system and the expansion valve as well. The GM shop
manual on the A-6 compressor said to replace ONLY those o-rings which
were disturbed and expansion valve replacement was not necessary unless
the previous compressior had failed-and my system was working well, even
though it was running out of oil.) We then pulled a vacuum on the
system down to 28.5 " of mercury for 45 minutes.
We added 8 oz of Ester oil to the new compressor. A tech at
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