Need advice for draining A/C compressor oil

[Albert Ng <alng@expert.cc.purdue.edu>]

Hi All,

Before I retrofit my 5kcst's A/C system to R-134a, I would like to drain
as much oil from the compressor as possible. However, taking the whole
compressor out to drain the oil seems too much work for me.  

I wonder if there is any way to get rid of the oil inside the compressor
without removing it? I've tried to run the compressor (with Hi/lo hoses
off) but nothing come out from the Hi side port. Is that mean there is not
much oil in there already?



Thanks Million


Albert Ng
'87 5kcst