[DML] Re: Vacuuming A/C

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

When you only partially evacuate an A/C system you do not remove all
the gases including water "vapor". The only way to do it properly is
to pull a "hard" vacuum. The results of not doing it thoughly is that
the system pressures will be higher because of the gases you did not
remove, you will not get the proper charge of refrigerent in because
of the presence of the non-condensable gases in the system, and the
worst, the moisture will combine with the refrigerent oil to
contaminate it and turn it acidic. This will corrode the insides
plugging up the smalll passages, damaging seals and ruining the moving
parts of the compressor. If the automakers could get away with the
added expense of having to pull a "hard" vacuum don't you think they
would? Sometimes you just have to buy the right tools to do some jobs.
This is why I recomend that for A/C work (and alignment work) where
the "cost of admission", ie the tools, is so high and used so
infrequently, that you should just go to a shop and have the work
done. Ditto for fixing and balancing tires, and emissions testing. BTW
the consequences of not vauuming out a system properly are supposed to
be even worse for -134. Years ago there used to be a kit you could buy
that allowed you to pump up tires with the motor by removing a spark
plug. It isn't sold anymore. It seems it fills the tire with a
COMBUSTABLE  mixture of air and GASOLINE! Using a heat gun does not do
away with the need to pull a hard vacuum, all it does is speed up the
process. No one can tell you what and how to work on your cars, I am
only pointing out the disadvantages of your method. Someday you may
sell one of your cars and the A/C may not be working so well because
of this. You could fill the A/C system with Propane and it would cool
good too but I don't hear anyone trying that although it is a lot
cheaper than R-12!
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote:
> 
> When I vacuum an A/C system, it does not have standing water in it.
> Moisture is already vaporized. Remember: I just flushed with outside





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