[Vwdiesel] a/c evacuation

[James Hansen]

Most likely a blockage, yes.  When you hook a recovery unit to the system,
on mine, you choose which line to pull from, usually low as that is where
most of it is.  You are SUPPOSED to look at the gauges that are reading
pressures and vacuum on both hoses... sort of a no brainer, but I suppose,
if the dessicant bag in the receiver dryer has broken, 
dessicant media has plugged the expansion valve, and you pull from the low
side, and nothing flows through the pump, you could duplicate what
happened.... which is why you are supposed to look at the gauges on both
hoses, and they should both be negative when the reclaimer is done.  This
sort of highlights why you wear safety glasses when doing a/c work, if freon
escapes and freezes your cornea, you are blind in that eye until you are a
candidate and can get a corneal transplant.

The dryer should be sealed, yes.  In a pinch you could use an open one, and
leave it on vacuum for a long time to get the water out, but it's hardly fun
to start pitching with a strike or two against already.

Your freon came out green because someone put uv sensitive dye in there once
to find a leak most likely.
-james


-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of lbaird119 at aol.com
Sent: June-09-13 12:05 AM
To: sshourds at flash.net; vwdiesel at vwfans.com
Subject: Re: [Vwdiesel] a/c evacuation


  I believe a regular, reclaming station will connect to both sides then
pump it into a container.  You don't have to do both sides but 1) it's
faster to pull through two ports and 2) if there's a blockage then you
evacuate the whole system rather than just one side, as it sounds like
happened to you.  Either that or he charged you and omitted  (intentionally
or accidentally) the step where he removes the refrigerant.  The other trick
I do is to only evacuate down to about 0psi.  Going lower sounds better but
causes the system to draw in outside air where at zero to a slight pressure
keeps most air out since you're usually doing a fairly quick swap.
     Sure sounds like your reciver/drier is probably already damp unless it
was in a sealed bag or something.  Otherwise an open port into it, will let
moisture into the dessicant and it's not going to dry your system much.
    Loren



-----Original Message-----
From: Shalyn Shourds <sshourds at flash.net>
To: vwdiesel <vwdiesel at vwfans.com>
Sent: Sat, Jun 8, 2013 8:50 pm
Subject: [Vwdiesel] a/c evacuation


I swapped out the a/c compressor this evening.  I'd previously had the
efrigerant evacuated at a nearby VW shop.  Tonight, I found out there's
another ind of a/c evacuation wherein the mechanic pulls the discharge line
off the ompressor and, no matter how little working room there is under an
A4 Jetta, nstantly evacuates to escape the green, oily, 134A blowing out of
the line.  
I don't know how the a/c recycling unit works, whether it draws from just
one ide of the system or both, but I'm thinking there was a blockage in the
ystem.  Hopefully, it's either an internal failure of the compressor or
omething in the expansion valve or receiver/drier because those are the
parts 'm replacing.  
Sorry, I'm clearly in the learning stages of a/c repair.  Something I'd
hoped to ever get good at.....
Thoughts?
-Shalyn
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