[DML] Re: Air Conditioning

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

I did not mention R-134 because I do not recomend converting. As long
as you can still get R-12 it is the best to use since the system was
DESIGNED for it's pressures. Any other refrigerent will not work as
well. If you can't (or won't) use R-12 there are drop-in replacements
that can proform almost as well as R-12 (and better than R-134).
 As for pulling vacuum, you cannot read low vacuum in inches. You have
to go to other, more sensitive scales. I use microns. You can actually
measure the amount of moisture with it. I say pull a hard vacuum for
an hour. If you have a micron gauge you run the vacuum till you see it
drop down and stay down for a while. That means all of the moisture
has vaporized. You should also turn the compressor by hand during the
evacuation process to lubricate the seal and expose all the chambers
inside to the vacuum. I have seen the consquences of running a system
with too much moisture. It will last a lot longer if you get the
moisture out. In fact with a hard vacuum you can pull the residual
moisture out of the dryer so it doesn't have to be changed if the
system is not contaminated. I do not expect to change your mind on
this but can only point out the "correct" way to work on A/C systems.
A good vacuum pump IS expensive, that is why I recomend owners go to a
good A/C shop with a reputation for quality work. It may be expensive
but if it is done right you won't be going back every year. On
Deloreans we are kind of "lucky" that it is a rather generic system
that just about any well equiped A/C shop can service. The only
special tools are to rebuild the compressor and most shops will just
change it if there is a problem anyway. Using the engine to "vacuum"
the system won't even get all the air out let alone remove much moisture.
David Teitelbaum
vin 10757



--- In dmcnews@xxxxxxxxxxxxxxx, "content22207" <brobertson@xxxx> wrote:
> As the owner of several A/C systems that work perfectly, and which I
>







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