I will try tomorrow. Shouldn't it read 0 if I have a leak?
Also, I am pretty adept at working on cars, but I am a supreme novice when
it comes to A/C. Can somebody suggest a good book that I can read to get
take your vehicle to a qualified service technician. a/c isnt something for
the novice. you can bullshit your way through it with the $9 pressure gauge
from pep boys, but you need to fix the leak before you bother with charging
the system (unless youre just looking for a temporary fix).
The thing is, I would really like to learn, and what a golden opportunity
now that I have a broken system (I actually have two) to get some
I am not afraid to spend some money on equipment, I just don't know what
to buy, or how to use it.
If what you are saying is that it is too complicated, or involved for the
do-it-yourselfer I respect that I guess.
Does anybody know a way that a guy like me could learn more?
The problem with AC is that you are dealing with high pressures and if you
screw up, things can go wrong that can hurt you as well as damage expensive
components like the compressor. Another problem is that many of the tools
used for AC service and repair are pretty much useless for much else and are
rather expensive. I myself look at the cost and usability of the tools and
my time compared to the cost of having the repair done. If I have other
uses for the tools or I know that I will need to use them again then I buy
them and make the repair myself otherwise it makes more economic sense to
just have the repair done for me. There are books on this stuff and if you
really want to learn, I would go there first.
If at first you don't succeed, you're not cut out for skydiving
"Surfersabo" < firstname.lastname@example.org> wrote in message
So what tools are so expensive that are required to work on an A/C
system? I have been working on them for years and can't think of any
tool that is that expensive. With a set of gauges and a book telling you
what pressure at what temp you should be looking for I can't think of
anything on an auto that is much easier to do than charge an A/C system.
Yes maybe a vacuum pump but if you are a little resourceful a used
compressor out of an old refrigerator with a connector on it makes a
great vacuum pump and basically free.
no, but it IS handy for pumping the system down to see if it holds vacuum
if it holds, THEN hook up the 'big dog' overnight
and, BTW........if you find an OLD one (pre about 1980), you'd be surprised
how good a vacuum it WILL produce
the new ones are for crap for this use, tho
so why go through the trouble to begin with? if you have the "big dog" (and
youll HAVE to at some point before charging the system), why bother with a
makeshift system just to see if it will hold the vacuum? besides, with
proper equipment (a 2 stage vacuum pump) its pointless to bother with an
overnight pull. a quality vacuum pump will pull it down just as hard in 15
minutes as it will in 24 hours.
it may produce more vacuum than the newer compressors, but it will _never_
produce anywhere near the 500 micron target which is required to pull out
all the moisture and non-condensables. there are a _lot_ of home remedies
that might get you by, but this is what makes the difference in 45 degree
vent temps and 55 degree vent temps. having the proper tools makes the
difference in a 3 year expected service life, and a 15 year service life.
if its 101 degrees out and you dont have any money i guess you do what you
gotta do to get by. hell, i ran propane in my camaro a/c system when i was
17 lol. but in hvac/r there is no short-cut, and no way to save any money
if you want to consider it fixed right.
I think you have better find one and try it before you say that
pulling that little bit of extra vacuum will product a colder vent temp.
So how many atmospheres does one of these super vacuum pumps pull ?
I have found that when a HVAC system has really failed it should just
simply be replaced with a completely new system. It ends up being the
overall cheapest way to do. Usually the new system is so far more
efficient that it will pay for itself in a couple of years.
With any AC car, home or commercial when it's opened to the atmosphere
you need to evacuate the system. Meaning you need to remove ALL of
the air and moisture from the system. I have no clue what the cost of
the equipment for evacuating and measuring a charge is for a vehicle
but you're going to spend a grand or more for the equipment for
similar residential equipment. That's assuming you have nothing to
A $1,000 you got to be kidding. Be resourceful and it will not even cost
$100. Yes if you are going ot follow the law then buy the recovery
system but I find that most A/C is discharged anyway when it needs work
and if you have to discharge a little of what is left then just close
your eyes and do it. Also remember every auto A/C system is set up to
leak and will. If you have to add a can every other year or even every
year that does not mean you have to get it fixed or may not even be able
to fix any better that that. Any place that you have a shaft with a
seal around it will leak. Now that brings up a question, Why didn't the
auto industry go with a sealed compressor and operate it off a a
generator that generator a higher voltage than 12 volts to keep the
current down. Now that would have been more of a environment fix that
saying no more R-12.
Steve Scott wrote:
Been doing this for years. My recovery system is a tub of ice and a Freon
cylinder. Yes, it's slow. Yes, it does not remove every bit of Freon. But it
does get all the liquid so you're not releasing much. As far as a vacuum
pump. I use an old refrigerator compressor. They way you get the moisture
out is you pull a vacuum. Wait to see if it leaks. Might have to do this a
few times as Freon hides in the oil and takes a while to come out. Then you
add a bit of Nitrogen, about 3 PSI. Wait a while and pull vacuum again. The
Nitrogen will get the moisture out. While you're pulling vacuum the last
time heat the receiver/dryer with a hair dryer. Before you ask, we have race
cars that we use Nitrogen to control the throttle so we always have it. But,
it's not hard to get and if the system has not been exposed to air a long
time you can skip using it.
you will NEVER under the best of circumstances achieve anywhere near (not
even close) to the 500 micron target with a refrigerator compressor. you
might think it works great for you and thats fine and well but dont mislead
others into thinking your way works because it doesnt. it might enable you
to get cool air from your vents but its not as cool as it would be if it
were done right.....and your components wont last as long as they should.
you arent pulling a deep enough vacuum to evacuate all moisture and
non-condensables. sure it might get you by and im not busting your chops on
this. i just dont want others to think this is an accepable alternative.
i buy it in bulk at johnstones here in billings. i buy in bulk because i
change the oil in my vacuum pump after _every_ usage as recommended by my
vacuum pump manufacturer. this is why i attach a $5 vacuum pump charge each
time i use it (although most companies charge 15).
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