[V6-12v] Fwd: Re: AC running not so cold

[Tom Christiansen]

Folks,

The schrader valve on the compressor is actually an oil drain. Not a
charge valve. But it is indeed on the low-pressure side...

Tom

On 5/27/07, Wilfried Link <wilfriedlink at yahoo.com> wrote:
>
> --- Wilfried Link <wilfriedlink at yahoo.com> wrote:
>
> > Date: Sun, 27 May 2007 20:36:09 -0700 (PDT)
> > From: Wilfried Link <wilfriedlink at yahoo.com>
> > Subject: Re: [V6-12v] AC running not so cold
> > To: Kent McLean <kentmclean at comcast.net>, quattro
> > <quattro at audifans.com>,
> >     V6-12v at audifans.com
> >
> > If your 94 is like my 95, the only actual low
> > pressure
> > service fitting is on the compressor's outboard
> > side.
> > I have had my car serviced through the high pressure
> > fitting on the condenser (easily visible on the
> > right
> > side of it when you open the hood) by a local
> > Firestone shop and it worked wonderfully for three
> > hot
> > seasons. I have also had it serviced through the low
> > pressure switch port right on top of the evaporator
> > under the right windshield wiper. The switch is
> > easily
> > unscrewed, and won't expel refrigerant because it
> > has
> > a Schrader valve under it. The technician I worked
> > with used a hose from an older servicing system that
> > screwed right onto that fitting. R134 wouldn't flow
> > in
> > until I figured out how to use a tiny Schrader valve
> > spring as a way to depress the Schrader pin on the
> > fitting (duh!), the way a normal, industry-standard,
> > blue-capped quick-disconnect fitting's pin is
> > depressed by the servicing equipment (or can) hose
> > connector. Unfortunately for me, that technician,
> > who
> > had the afformentioned mysterious old hose in his
> > private stash, has moved away. And my AC is once
> > again
> > very weak. And the weather is getting hot around
> > here.
> > Blast! There are several adapters available online
> > and
> > at auto-parts stores (the local Big-A has a few),
> > usually intended for Freon to R134 conversions. One
> > end is the standard R134, blue-capped, lo-pressure
> > quick-disconnect fitting, and the other is usually a
> > threaded female end for screwing onto the old Freon
> > fittings. I have yet to find an adapter that will
> > fit
> > the Audi's low-pressure switch-cum-service port,
> > which
> > is a M12x1.5 male. When I do, I'll have the problem
> > licked and let everyone know! Now that I think about
> > it, I may try and make one by tapping out its female
> > end to fit. Then it's just a matter of ensuring the
> > Schrader valve is opened by connecting the service
> > fitting, and carefully monitoring pressures.
> >
> > Cheers,
> > Wil
> > 95 A6 Avant
> >
> > --- Kent McLean <kentmclean at comcast.net> wrote:
> >
> > > When I bought my '94 100 S Avant, the AC worked
> > > fine. It wasn't ice cold,
> > > but it was cold. Now, 3 years on, it doesn't blow
> > > cold, and summer is here.
> > > My new-to-me '91 200 20V Avant, on the other hand,
> > > didn't blow cold or
> > > even cool when I got it. So...
> > >
> > > - Is there a good on-line tutorial for how
> > > automotive AC works?
> > > - Does my '94 have a low-pressure valve for adding
> > > R134a? (I know
> > >   some Audis only have a high-pressure valve.)
> > > - I don't know that the '91 has been converted to
> > > R134a. Will a
> > >   cheap R134a conversion kit let me use R134a? Or
> > do
> > > I need to
> > >   change things (hoses, compressor, etc.)?
> > >
> > > The '94 is a non-automatic climate control. Yup,
> > it
> > > has 3 big
> > > old-fashioned knobs :) So debugging its system
> > using
> > > the CC
> > > won't work there.
> > >
> > > Thanks,
> > >
> > > --
> > > Kent McLean
> > > '91 200 TQA #1, for sale
> > > '91 200 TQA #2, no name yet
> > > '94 100 S Avant, "Moody"
> > > '89 200 TQ, "Bad Puppy", up in smoke
> > > _______________________________________________
> > > V6-12v mailing list
> > > V6-12v at audifans.com
> > > http://www.audifans.com/mailman/listinfo/v6-12v
> > >
> >
> >
>
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