[Vwdiesel] A/C Compressor?

[James Hansen]

If you're making 600# the compressor is working.
Stop before you kill something, burn the clutch, smoke a belt, etc.... at
least your high side protection is working...
>From my limited experience, the most likely culprit is a broken dessicant
bag in the receiver-dryer.  A dessicant pellet gets as far as the expansion
valve, and plugs the orfice.
Can you see into the receiver dryer window for flow? (tiny window in the
line above the dryer?)  I'd evac, remove the dryer, check for loose
dessicant, flush and clean as necessary with straight isopropal alcohol
replace the dryer even if it's good, evac overnight or at least hold a vac
for 4-5 hours to get all the water and alcohol out, then recharge and see
what's up.  Should need some oil too... have to kind of estimate that as to
what you take out with the dryer...

IIRC, our B4 ranged from 35-40 on low side, 180 on high, but NOTHING
replaces a recharge with a known weight of freon.  These low volume systems
are real finicky about how much is in there.  2005 Passat holds 600g of
134a.  You pretty much need to measure that in from an evac, hard to judge
it right by gauge behavior.  I have so many systems here with the farm
machinery, I got a robinaire recovery/recharge unit.  Saves many many
headaches, yet there are a couple units that are just filled with gremlins.
-james

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of lbaird119 at aol.com
Sent: July-01-12 10:03 AM
To: vwdiesel at vwfans.com
Subject: [Vwdiesel] A/C Compressor?


Well, warm weather is here (then gone, then  here...)  So the wife wants the
A/C to work.  It halfway pooped out as we were coming home, through NV.
Turn it off a bit, then on and it'd blow cool for a while until I'd turn it
off, wait then back on.
  Eventually I paid the ransom and put a can of 134a in it.  It didn't
really help.  Took it to a friend that I borrow stuff from and has done me
good on diagnosing stuff that flusters me.  Pressures were too high
(overcharged) and not really doing much.  He concluded the expansion valve
was the culprit.
  Yesterday I pumped out 4 an da dab cans of freon (one blew the relief out
of the bottom so there went one can of salvage!)  I changed the valve and
o-rings except for one wrong sized one they sent, recharged it and poop!
Low side drops about 10psi or so, when it kicks on.  Compressor stays
running, low doesn't drop, high doesn't climb.

  So, what's the consensus, bad compressor?  Never had one before.  Anybody
have a good one sitting on a shelf, to fit a B4 Passat?  :-)
    Loren
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