12 to 134a Conversion

[Einhorn Hofmann]

Hi Kneale,
I wanted to replace the hoses but I wasn't planning to, simply because I
thought they were probably impossible to get a hold of.  I was under the
impression that they were probably custom made for that each model, and the
only alternative would be to find someone to take the originals and
fabricate them.  If you're suggesting that I"m wrong, and you have a source
for hoses, you've made my weekend :-)

Best wishes,
MC

On Sun, May 20, 2018 at 5:21 PM, Kneale Brownson <kneale at knitknacks.com>
wrote:

> Are you replacing the hoses?
>
> Tediously fingered on my iPhone
>
>
> > On May 20, 2018, at 4:35 PM, Einhorn Hofmann <einhorn.hofmann at gmail.com>
> wrote:
> >
> > I've decided to do a rebuild on the A/C on my Audi 100, 1990.  The Car’s
> in
> > otherwise good shape, and my local VW/Audi independent garage has agreed
> to
> > do it if I get the parts.
> >
> > I’ve managed to located everything I need so far at one company…with the
> > exception of the Condenser.   I can find condensers on ebay, but ideally
> > I’d like to order everything from one place  -- reason being that in
> Canada
> > we can get hit by some pretty nasty “Customs Brokerage fees” if we’re not
> > careful.  The shop I’ve sourced everything else at handles the brokerage
> > fees (unlike your average seller on eBay).
> >
> >
> >
> > The questions I had:
> >
> > 1.)    If the existing evaporator looks in good shape, would it be crazy
> to
> > do a rebuild without replacing the condenser?  I had no plans to replace
> > the evaporator inside the car, since I assume it’s as difficult a job as
> > replacing the heater core which it sits next to in the passenger footwell
> > (?)
> >
> >
> > 2.)    Has anyone located a condenser for another vehicle that’s close
> > enough in size, to fit the i5 engines, even if it requires some minor
> > mods?    I'd imagine there might be enough room for a different slightly
> > different condenser.   The i5’s are at an angle on the driver’s side,
> > (unlike the V4 and V6 which I believe are perpendicular to the length of
> > the car and centered.)
> >
> >
> >
> >
> >
> > The plan is to replace the compressor, receiver/dryer, all seals, and
> > presumably the mechanic performs a flush prior to drawing the vacuum, and
> > doing the R134a conversion.  As an aside, he mentioned that he actually
> had
> > two cylinders of R12 left over, but if he was caught using them, the
> fines
> > were ½ a million dollars.  I asked about the increased pressures and
> lower
> > cooling after an R134a conversion.  He mentioned that you typically see a
> > 10-15% lower cooling efficiency after the conversion, which most people
> > don’t notice, and furthermore its academic since there’s no alternative
> for
> > retrofitting an R12 car.
> >
> >
> > Thanks for any input,
> >
> > MC
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>