The ones formulated to also tolerate R134A are usually
green. (I don't know that they'd have to be.) R134A
(or its oil) attacks the black rubber ones that were
good for R12 systems.
-- Jim
Are 'green' ones backward compatible to R12?
Rusty site has 2 kinds of o-rings (with pix) Online catalogue 1985 -
00SD - Climate Control - A/C O-Ring
First - A/C O-Ring - A/C Compressor - Used together with R-4 or A-6 Type A/C
Compressors. (Normal round cross-section looking o-Ring)
Second - A/C O-Ring - For Non-Stepped Ports - GM radial R-4 version (Flat
looking rubber washer seal thing)
Where else in the system are they used ?
George Larribeau
Dallas, Texas
1985 300SD 190K
