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Hmm. I havent done mine in the plane since summer and have not done a car
R12 system in while, but I remember the pressures were lower on the high and
low sides. Also, we had to get a completely different set of gauges at the
shop when the cars shifted from R12 with a bunch of different fittings
because the 134a stuff has a different line fittings. Also, in addition to
the dryer, I think you have to replace the hoses because they need to have
the nylon barrier type, and the O-rings. This is because of the different
type of oil.

Just curious. Do many mechanics work on A/C? I know when I went to have my
system checked I could not find anyone to do it because of the low volume
and high cost of the equipment. We ended up doing it outselves since we
have the equipment and do a ton of A/C work on cars in the Central Valley.
We had the local A&P look over our shoulders to ensure we did not do
anything stupid.

jerry

"Nick Funk" wrote in message
news:3C8E7B4D.99634D42@earthlink.net...
> Not sure if compressor would need to be changed. I have done several
automotive
> system without changing compressor with great success. We did flush the
system,
> replaced the dryer/filter and replaced the oil in the compressor (oil
changed
> isnt required if the existing oil is compatible with H134a). Been
several
> cooling seasons here in hot and muggy Louisiana and systems are
functioning
> great. Head pressures are a little higher than R12, but that probably
wouldnt
> be a concern in aviation due to increase airflow across the coil.
>
>
> JerryK wrote:
>
> > I would expect that to be a rather expensive proposition. You would
have to
> > change the compressor and probably the condensor. Not sure about the
hoses
> > and evaporator. Mine was R134A originally, so I got lucky.
> >
> > Alternately, you used to be able to find R-12 in auto parts stores in
> > Mexico.
> >
> > "Juan Jimenez" wrote in message
> > news:OHqj8.27624$ZR2.14353@rwcrnsc52.ops.asp.att.net...
> > > These folks have an STC for the conversion from R12 to R134A
refrigerant
> > on
> > > a/c systems for Piper aircraft. If the price is reasonable, this ought
to
> > > save you a world of grief and unnecessary expense every time you need
to
> > > service the system...
> > >
> > > The FAA STC database gives this info:
> > >
> > > Steinbach & Associates, Inc.
> > > 2224 Carolinda Drive
> > > Waco TX 76710
> > >
> > > But the Yahoo yellow pages for Waco gives this contact info instead:
> > >
> > > 7909 Airport Rd
> > > Waco, TX 76708
> > > (254) 752-6773
> > >
> > > If they have a web site, it sure is well hidden...
> > >
> > > Juan
> > >
> > > "piperflyer" wrote in message
> > > news:Q8gj8.105453$Dl4.10739513@typhoon.tampabay.rr.com...
> > > > Does anybody know What type freon is used in the air conditioner of
a
> > > Piper
> > > > Warrior II (1979)? Couldnt find this in the operating manual.
> > > >
> > > >
> > > >
> > >
> > >
>

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