Remove your compressor, drain mineral oil, flush compressor and lines
w/non clorinated brake cleaner using an air compressor and blow tip to
remove old oil/junk.
Fill compressor w/PAG oil.
Install new expansion valve.
Install new filter dryer.
Close all lines.
Vac system.
Install new R 134a ports.
Charge to around 40 PSI on low side: 80% of R-12 charge. Sight glass may
still show bubbles.
Cold air blows and your done.

"Fitz-Randolph, Douglas" wrote:

> Hi all. Does anyone know of a good article on a website
> or a good list posting that covers R12 -> R134A AC
> refrigerant conversion? I've got the little $30 kit
> from InterDynamics, I've located the high and low
> service ports, but just wanted to do some further
> reading before proceeding - I know this was a topic
> discussed at some length a while ago, but I haven't
> had much luck searching the archives lately.
>
> Thanks.
>
> > Doug Fitz-Randolph
> > Freeport, ME
> > '90 Syncro