I'm not an A/C expert or nothin', just know some basics
I think everything existing is fine,
When you convert, the oil must be changed out, and replaced with PAG
I have done it on several vehicles, removing the compressor and dumping the oil, replacing w/ PAG, re-installed the compressor using the "Green 'O' rings"---(anytime a line was opened too)
Installed 134a "fittings"
I did not try to "Blow" any more oil out of the system. Pulled a 1 hour vacuum. Filled w/ 134a, watching the gauges. But more attentive to "sweat back". Stopped filling, before "sweat back" reached the compressor.I never reach 30 on the gauge, I cannot accurately install gas amounts, without special equipment. I "wing it" watching sweatback. "Sweatback" is the condensation forming on the suction line---this is point where gas is is turning to liquid--liquid will ruin a compressor!
No problems, thus far. Mom and Dads '86 T-Bird still cooling fine, over 10 years later. Other vehicles were traded by family, long ago, do not know their status
Remember--I'm not a A/C man
If in doubt. See the Man!
Monday, August 1st, 2011 AT 9:42 PM