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

[Wilfried Link]

--- 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
> > 
> 
>