A/C R134a vs R12

[bandmgrinding@xxxxxxxx]

Hi Gang,
     On freon R12 replacement. Most of the guys I have talked to have had
very good results with R406. It is sold under different brand names but
is compatible with mineral oil which is what is in the R12 systems. You
use less of it and the temperature at the evaporator is actually colder.
You must charge it into the system as a liquid because it is a blend of
different refrigerants. I have not tried it yet but intend to very soon.
You must remove any R12 that is in the system now and follow the chart
for the proper amount to use.
   Also, don't forget to clean your condensor, preferably with a good
coil cleaner available at a refrigeration supply. When I was doing A/C
repairs on customers cars and did this, the temperature at the ducts used
to drop by almost 10 degrees on most cars because of the better heat
transfer due to a clean coil. The high side pressure would drop as well
which was an added benefit.
   Allan R

On Tue, 9 Apr 2002 04:43:56 -0700 (PDT) Mike Pittinaro
<mechimike@xxxxxxxxx> writes:
> > Other question: In instruction for the compressor 
> > written it's suitable for R12 and R134a is it 
> > possible?
> 
> You will get a TON of opinions about R12 vs R134a on
> this list, esp. now that cooling season is here.  But
> here's the facts:  There is no direct drop-in
> replacement for R12 as of this date.  R134a can be
> used IF:
> 
> The system is evacuated of all R12 and oil.
> The filter dryer is replaced.
> There are no leaks in the system.
> The system is drawn down to a 30" vacuum, or about 500
> microns.
> 
> You then charge the system with R12 mingled with the
> proper oil.  Pep Boys sells both R134a and the proper
> oil...ask them to find out what oil to use (I
> generally work around R22, a commercial refrigerant,
> so I'm not up on the proper oil to use)
> 
> Some people will tell you that they've just charged up
> R12 systems with R134a and "it works great".  I don't
> dispute their experience, but they are rolling the
> dice- it may work, but it shouldn't, and there will
> probably be long-term problems.  The oils aren't
> compatible, the refrigerants themselves have different
> properties, and God forbid they ever take it to a
> professional to have any work done on it.  
> 
> Also, some converted cars don't cool as well with
> R134a, because its condensation point is higher than
> R12.  But, on an Imperial which already has a hugely
> over-designed cooling system, it isn't a problem.  I
> replaced the filter dryer, compressor, and clutch on
> my '67, had a vacuum drawn and charged it up with
> R134a and it cools very well.
> 
> =====
> --Mike Pittinaro
> 
> My girlfriend left me
> My trusty Imperial
> Remains more faithful
> 
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