I'm wanting to add refrigerant in my 1999 Dodge Ram 1500. I purchased a
can of refrigerant at my local auto parts that included the quick
release coupling for the low pressure side of the system. When I tried
to add it, I found the coupling for the can of refrigerant was too small
for my port installed on my truck (I'm sure it's the low pressure port
I'm trying to add it in, but for sake of argument I'm trying to add it
to the port on the passenger side front just behind the radiator
support). I measured my port (.552") and the coupling on the can of
Does Dodge put on a different port than standard? Are there adapters to
be had? Where? (The guy at the parts place was clueless...) It looks
like the port I have will unscrew from the line, but that would require
evacuating the system, and I don't have a vacuum pump. For that matter,
is that the right port?
My advise to you is if you don't know what you are doing, have someone else
do it. you could cause injury to you or your truck by doing this. The ports
are designed so that a low side valve cannot be installed on a high side.
you are already trying to connect to the high side. if for some reason you
succeeded with this..the can would have exploded in your hand.
Just a thought.
I have to admit that your answer pissed me off at first. However, it
got me thinking that I'd better go double check myself. I was using a
Haynes manual and it shows the connection where I described. I didn't
double check. I realized then that the line I was trying to charge WAS
the high pressure side. The low pressure side goes to the compressor
and was hidden under the air filter snorkle.
So anyway, I tried charging it and the compressor is still not running
(I bypassed the low pressure switch to keep it going).
Gotta think about plan b.
P.S. I am experienced on AC&R systems being trained in the military,
but my experience was with ships with water cooled condensors and much
larger systems. I have to admit my skills are a bit rusty. I also
don't have the tools I used to have. I also don't like paying someone
else to do work I can do.....
Sorry to get you upset, but if I think someone isn't familiar with something
that could hurt themselves I normally don't reply, I have seen and heard of
to many incidents where people got hurt from charging the system thru the
high side and blowing up the can. The other problem I have is I haven't
worked at a truck dealer for over 7 years so I couldn't tell you where the
low side fitting is on that truck. And using that Haynes Manual will really
get you in trouble. If you are going to be a do- it -your selfer I would
highly recommend purchasing the factory books. Use the Haynes manual for a
door stop only or a nice fire in the winter
Hmmm...now there's an idea! I bought a (Haynes or Chilton, not sure which)
manual for my 92 Dodge Caravan some years ago at a yard sale or something.
The two times I referred to it for help, it was useless. First was for an
odd-ball little tiny corner lightbulb replacement (so it would pass VA state
inspection)...it seemed to only have those details (vaguely) for pre-91
models. The other time was when the pot metal broke on the ignition lock
cylinder and I was trying to figure out how to replace it...again, I recall
it was only giving info on the pre-91 models. Or perhaps it just said "this
thing has an air bag, don't do anything yourself." I can't remember for
sure now... Aside from that, it's made for a nice dust collector!
Playing with 134-A is not for the inexperienced. As a certified AC Tech
I make a lot of money from those over the counter do-it-yourself sales.
Pressures and volume are critical on 134-A. I don't even try to fill by
pressure anymore. I fill by volume and watch the pressures. This isn't
like the old days of R-12 and a piston compressor. They were very
forgiving. 134-A and rotary compressors are not forgiving. Just a few
ounces either way and you will be visiting someone like me shortly
because your compressor died before it's time.
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