[Shotimes] A/C R12 to R134a Conversion Questions

[Kevin & Cheryl Airth]

I think the Nylog would be good to use. The Helm manual specifically states:

"CAUTION:
To avoid damaging the vehicle or A/C components, the following precautions
must be observed:
 Install a new O-ring seal before connecting an open fitting. Coat the
fitting and the O-ring seal with refrigerant oil before connecting."
 I would not use the grease without some more information.
.
.


> http://www.acsource.com sells a good o-ring lubricant called Nylog.  I
have
> spoken with professional A/C techs that use this stuff, and highly
recommend
> it!
>
> ~Chris

>
> > A little "O" ring grease is recommended rather than freon oil as freon
oil
> > will absorb water and will rust up quickly making it hard to impossible
to
> > remove in the future. The small amount on the "O" rings will never get
in
> > the system.
> > Subject: Re: [Shotimes] A/C R12 to R134a Conversion Questions
> >
> >
> > > Heikki:
> > >  Use whatever oil you are putting in the system to lubricate the
> o-rings.
> > > Any other grease or oil is NOT recommended! The o-rings are different
so
> > be
> > > sure and use the "Green" ones. They are available separately. Consider
> > > changing the condenser too. Depending on the condition of it and where
> you
> > > live in the country. R134a is not as efficient refrigerant as R12.
What
> > this
> > > means is that to achieve equal cooling you need a larger condenser and
> > > evaporator, which is what the factory did when they swapped to R134a.
> You
> > > may never see this effect if the A/C is not loaded to maximum. I live
in
> > > South Louisiana and with the high temperatures and humidity the A/C
> system
> > > is pretty much at maximum output in the summer.
> > >
> > >  Yes I would order 94-95 A/C parts since these cars were factory
filled
> > with
> > > R134a. Replace the liquid line and the filter/dryer/accumulator for
> sure.
> > > This should be done anyway with the age and miles our cars are now at.
> If
> > > not changing the compressor be very careful which oil is used. There
are
> > > compatibility issues if you are not aware. I would also do a good
flush
> on
> > > the remaining  components that are not changed. Mainly the evaporator
> and
> > > condenser if you keep the old one. Check this place for good A/C info
> and
> > > parts prices:
> > > http://www.ackits.com/
> > >
> > > Last: Consider how your system failed. Is it still working? The number
> one
> > > problem with retro fits is not cleaning the debris out from the prior
> > > failure. You can easily ruin all your new parts trying cheap it out!
> > > Compressor is your main culprit!!
> > > .
> > > .
> > >
> > >
> > >
> > > > I am currently collecting parts to repair/convert the A/C in my '93
> MTX.
> > > If
> > > > someone has done this and is willing to help me out that would be
> > greatly
> > > > appreciated.  In searching for these parts I came across listings
for
> > the
> > > > liquid line and the accumulator/drier.  In most systems I have seen
> > there
> > > is
> > > > a component known as the filter/drier.  Is the filter in the SHO A/C
> > > > incorporated in the accumulator/drier?  Or is there an independent
> > filter
> > > > somewhere that I also need to replace?  Since I am converting to
R134a
> I
> > > > will also need to replace any other parts which are R12 specific.  I
> > read
> > > a
> > > > mention of replacing the orifice, which is part of the liquid line.
> Do
> > > the
> > > > liquid lines with the R134a orifice directly replace the liquid
lines
> > with
> > > > the R12 orifice?  i.e. Can I simply purchase a liquid line for a
'94+
> or
> > a
> > > > R134a liquid line for a '93- (if such exists)?  As for the
> > > > accumulator/drier, is this specific to the type of freon that is
being
> > > used?
> > > > Are there other parts that are suggested replacements?  I plan to
> > replace
> > > > the o-rings to ensure a good seal.  Can I leave the
manifold/discharge
> > as
> > > it
> > > > is?  If anyone has any info that may be helpful please let me know.
> > > Thanks.
> > > >
> > > > -Heikki
> > > > 'hA-kE