[Vwdiesel] AC woes

[Val Christian]

Nate,

Go to Autozone and borrow their AC clutch removal tool.  It clamps to
the clutch, and facilitates removal of the nut.  I've used a socket on
a mouse, which has enough impact torque.  On VWs, I've only pulled a
Sanyo clutch, so my VW experience is limited.  It was years ago, and I
have a standard puller set, so I was able to do it.  (Memory fades)

Oh, on my 91, with an R-12 system, slightly overcharged does not
adversely cause overcycling.  I can't give you metrics, but it cycles
less than the average car that I end up driving.  And I _do_ notice it
because the car slows down when the compressor fires up.  About 3 mph
at 70 mph road speed.

Back to the clutch, you should be just fine doing it on the car, although
you may need to pull the compressor off the mounts to get access all the
way around.  You won't need to discharge the system.  You won't need to
put the compressor in a press or otherwise wholesale remove it from the car.

A final divergence...R-12 systems generally work nicer in cars.  R-134a
systems are a pain.  The 134 has a smaller molecular size, which means it
leaks out faster.  A system which would keep R-12 for YEARS might only
hold R-134a for weeks.  Therefore, vacuum testing of R-134a systems is
important.  I tend to pull a vacuum, and then let it sit overnight.  If
it's gone from say, 29 inches to 25 inches, in 12 hours, I look for a leak,
and retest overnight.  Otherwise, I'm dumping R-134a into the system and
throwing $$$ away.  (Forgive the rant and rave about doing the job right.)

Val

ps: If you have problems with the clutch, drop me an email.  I have
a Sanyo in the basement with the compressor intact, and I can pull it
and verify how it works.









>
> Since we are on the sumject of A/Cs, I have a
> question:
>
> Jetta TD #2 has the wires to the A/C clutch cut
> through (a previous owner thing), right at the clutch,
> so a splice is questionable. But I have an identical
> spare used A/C compressor. How do I swap the magnetic
> clutch/coil between the compressors? I suppose I have
> to figure how to get the shaft nut off w/out the shaft
> turning. Can I do it w/out discharging the system
> (assuming there is refrigerant in it)? Tx.

>
> --Nate
> --- Val Christian <val at swamps.roc.ny.us> wrote:
> > Probably overcharged.  A manifold set will tell you
> > right away.
> > If you have a gauge set, and want some help, let me
> > know.
> >
> > It's hard on the system to run overcharged all the
> > time, as you see
> > from your belt problem.
> >
> > I confess to slightly overcharging my 91 system, but
> > it sure is nice
> > getting all the 32F air one can handle on a hot day.
> >
> > You should check the pressures, and consider backing
> > off some of the
> > charge, if they're high.
> >
> > Val
> >
> >
> > >
> > > I need a little help here.
> > >
> > > I have a 92 turbo diesel. When I turn on the AC
> > the tach drops 500 rpm
> > > or so. This, along with the fact that I hear a
> > belt squeal when the AC
> > > is on and the car is cold would lead me to believe
> > that the belt is
> > > loose.
> > >
> > > It isn't. In fact, the previous belt was
> > over-tight to the extent that
> > > it broke after about 2,000 km.
> > >
> > > Is it possible for the AC system to be overfull of
> > Freon, thereby
> > > putting too much of a load on everything? If so,
> > how would I check it?
> > >
> > > Ethan
> > >
> > >
> > > _______________________________________________
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> > >
> >
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>
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