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

Mon May 28 13:16:53 EDT 2007

Folks,

I went to an independent AC shop (Wedell Auto Electric in Seattle) to
have my 1994 90 recharged. It was recharged through the high pressure
port. The equipment at the shop seemed capable of this without
modifications...

I highly recommend Wedell, by the way. Great shop. Easy to work with.
I had them evacuate my AC system so I could work on it. They gave me a
credit for the R134 that was in the system. They were willing to let
their vacuum pump drain the AC system overnight and recharge it in the
morning. Very cool deal.

Tom

On 5/28/07, Casimiro Izquierdo <caig01 at yahoo.com> wrote:
>
> Gentlemen:
>
> If anyone knows of a way to charge this system, other than going to the
> dealer, please post it.  I have been having this problem and have posted
> about it, for the last three or four years.  My 1995 - 100S has R134 and is
> supposed to be charged from the high pressure side also.  No amount of
> coaxing or trying has allowed me to charge this system using parts bought
> from local auto shops.
>
> Do A/C shops have the ability to do this, or is the charging of these
> systems the exclusive purview of Audi dealers?  I ask this because if
> someone has had a successful experience with a major repair store chain, it
> would be interesting to know.  The other reason for asking the question is
> that I do not want to start putting the car in the hands of experimenters
> who may do more damage than good.
>
> Thank you.
>
> Casimiro
>
> ----- Original Message ----
> From: Tom Christiansen <tomchr at gmail.com>
> To: Wilfried Link <wilfriedlink at yahoo.com>
> Cc: v6-12v at audifans.com
> Sent: Monday, May 28, 2007 1:18:03 AM
> Subject: Re: [V6-12v] Fwd: Re: AC running not so cold
>
> 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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> > V6-12v at audifans.com
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> >
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