No subject

Thu Nov 20 12:02:46 EST 2003

experience, is that VW uses oversized A/Cs, and that
to me means that R-134a should fare fairly well in

--- Fernando Fiore <ecodiesel1 at> wrote:
> >  Isn't anyone on the
> >group a refrig tech, who can authoritatively set us
> all straight?  It would
> >be great!
> >
> Well, I can't say that I am a Certified A/C
> Technician.. But I did grow up
> working in my father's shop in Florida working on
> A/C all summer...  You all
> are on the right track, nothing stated so far that
> was completely wrong at
> all...  As far as the original person (lost who it
> was now!) with the
> compressor woes, it sounds like the compressor is
> just starting to fail and
> lockup... that is the common diagnosis (I know thats
> the answer you don't
> want to hear).  Someone else mentioned that as well,
> and how it probably
> went low on refrigerant, thus loosing the oil.  When
> you start to get leaks
> in your system, the amount of oil in the system is
> often neglected... and
> thats what kills compressors.  If you are a pound or
> more low on
> refrigerant, I would throw an ounce or two of oil...
> I would rather be an
> ounce over in oil rather than running the
> possibility of having no oil.
> Really, what should be done is a recovery and pull
> vacum with a recovery
> machine... and then recharge to the correct level
> and add oil... which is
> still fishy because you don't know how much is in
> there, unless you took the
> system apart, drained the compressor and
> reciever/dryer or accumulator,
> flushed everything of oil, then added the spec.
> amount of oil for the car.
> Having the correct amount of oil in your system when
> you have a leak is
> tricky.  My 84 Rabbit from Florida has 209,000
> miles, with the factory
> compressor. I converted it to 134a a few years ago
> when my expansion valve
> was stuck closed (evap. kept on freezing!)  I was
> very meticulous with what
> oil to use and the amount, as well as flushing
> everything I could (not the
> compressor, never flush into the compressor or exp.
> valve, that was my
> teachings).  It cools great, but the R12 was a
> little better.  R134a has a
> higher condenser temperature, and it depends on the
> car and their R12 design
> if 134a works well in it.  It needs a larger
> condenser for that reason..
> Ford Aerostars were the worst, the condensor was
> designed to the limit, then
> on some they added a second evaporator for rear A/C.
>  On those, you had to
> eliminate the rear evap. to convert the system, to
> have it cool at all!
> That's my $0.02 I guess.
> Sorry for the long email!
> Fernando Fiore, "Nando"
> 84 VW Rabbit Diesel "GTI"
> 1/4= 21.249 @ 60.95mph
> 81 Audi 5000S Diesel
> 1/4= N/A
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