R134a retrofit questions?

[David Ullrich]

Wel, I've never owned a type$$ but on my old type85, I did the conversion
that way and it worked great. The key was putting in only about 75% of the
equivelent r-12 charge then slowly (VERY SLOWLY) adding more while
monitoring vent temps. When vent temps bottomed out, stop adding. I also
adjsuted the comrpessor cutout thermostat so that it didnt cut out until
termps hit 33*F...ended up with vent temps of about 35*F...nice and chilly.

Dave
-Audiless for now
-Wanted: CGT Triple White


On 10/23/08, John Cody Forbes <cody at 5000tq.com> wrote:
>
> Others may have different results, but every time I've tried 134a in any of
> the 4 5000's that I've owned (that had working A/C bits) I've been so
> dissapointed that I've switched back to R12. Living in south Florida with
> my
> black 5000tq I could only get cold enough to just barely stop sweating with
> 134a (vent temps in the high 60's). With R12 it would achieve the set
> temperature and vent temps in the low 50's or better.
>
> YMMV, etc.
>
> -Cody Forbes
>
> Dave Yentema wrote:
> > hey guys, got a couple of questions about converting the ac in my car
> > (875kt)
> >
> > she has never been retrofitted to 134, and from lack of use 90% of
> > the r12 is gone, its low to the point that the comp won't even run(I
> > tested this by jumping the connectors on the low pressure switch) So
> > after weighing out all the options, i've decided that the conversion
> > is my best bet right now.
> >
> > I've seen my dad do the conversions before, and whenever he did it
> > professionally he would just evacuate the r12, change the fittings,
> > drop some ester oil in and charge it up with 134 (Even though this
> > isn't the recommended procedure, it always worked) . He knows his
> > stuff with AC, does everything the old fashioned way with just the
> > manifold gauges and knows exactly what lines to touch, etc. Having
> > him help me on this isn't really an option for this.
> >
> > This is what I'm picking up:
> >
> > -New receiver/drier (from AutohausAZ)
> > -134a retrofit kit, not the one with the oil, but its got all the
> > fittings and o-rings I'd need (also from autohaus)
> > -Polymax2 oil http://www.autoacsource.com/store/coolzone_oil.html
> > -Variable orifice
> > tubehttp://www.acsource.com/index.asp?PageAction=VIEWCATS&Category=273
> >
> >
> >
> >
> > I know that the system holds about 39oz of R12, and it'll take about
> > 85% of that with 134, so about 33oz?
> >
> > and how much oil does it take? I read somewhere it takes 8oz but i'm
> > not sure.
> >
> > also, any reason  why I can't do all of this while its getting colder
> > outside? or should I wait till springtime to try and fill er up so to
> > speak
> >
> > any suggestions would be awesome
> >
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-- 
David G. Ullrich
Cavu Consulting
"Finally, Affordable Technology Help"