[V6-12v] AC question

Clive Young cyoung1661 at rogers.com
Fri Nov 12 16:27:52 EST 2004

I want to wade in on this conversation very carefully as my AC is not
working and I have been thinking about this for a while.

>From what I have read the Compressor kicks off in response to the thermistor
on or near the evaporator. It turns off in order not to freeze the
evaporator. But I am not sure what it is suppose to do  with the AC off. I
know many cars use the AC to take moisture out of the air when using the
windshield defrost function. The other important thing to know is whether
the cars have climate control . I think it will control the compressor etc
differently. Mine is a manual control and when I put the Ac on the
compressor runs a 100% duty cycle  ( never disengages clutch ) . I think
that would mean that the sensor on the evaporator never gets cold enough and
would be indicitive of my no cold condition. I would believe the manual
systems like mine just run the compressor full tilt and the temp control is
acheived by just mixing in warmer air via the knob on the dash that controls
the flapper. The only time the AC clutch would disengage is when the sensor
tells it to. Lino , if you want to get together to do some comparisons ,
just let me know , I am in Cambridge and I am often looking for an excuse to
go for a ride !

----- Original Message ----- 
From: "Lino M. Valadas" <l.valadas at rogers.com>
To: "Nathan Widmyer" <lighthousej at gmail.com>; "V6 12V Audi Mailing List"
<v6-12v at audifans.com>
Sent: Tuesday, November 02, 2004 7:13 PM
Subject: Re: [V6-12v] AC question

> Thanks guys,
> No.  It's definitely the AC compressor.  I've open the hood several times
> see what's going on and I clearly see the compressor clutch engaging.
> I'm in just outside of Toronto, Canada.  Today was 7 degrees centigrade in
> the morning.  I start the engine open the hood and I see the compressor
> kicking in and out with the air and recirculation buttons off.  As James
> Whitehouse pointed out, his mechanic feels it's by design.  I'm starting
> think he's right.  But it's a lousy design.  My 1993 S4 does not do that.
> If anybody know how to turn it off please let me know.
> Lino
> ----- Original Message -----
> From: "Nathan Widmyer" <lighthousej at gmail.com>
> To: "V6 12V Audi Mailing List" <v6-12v at audifans.com>
> Sent: Monday, November 01, 2004 9:39 PM
> Subject: Re: [V6-12v] AC question
> > Are you sure it's not the radiator fans kicking in?  When my engine
> > gets too hot, the fans kick in to cool it down.  Does it sound like a
> > muffled drilling sound?  I hope I'm not a dummy about this and it
> > really is your AC.  Check out the links at:
> >
> > http://www.12v.org/maintenance/index.php?section=tr&ss=hvac
> >
> > In the climate control trouble code section, in at least my 90, has a
> > graphics channel (channel 52) that uses the segments of the climate
> > control to give you on-off conditions of different inputs to the AC
> > system to help you figure out if you have an errant input and where
> > you might want to check.  Good luck.
> >
> >
> > On Mon, 1 Nov 2004 20:19:14 -0500, Lino M. Valadas
<l.valadas at rogers.com>
> wrote:
> > > Hi guys,
> > >
> > > My AC compressor cycles on and off on its own every-so-often  more
> > > than not.  This is with the air turned off.  I find it very annoying.
> Does
> > > anybody experience the same?  Is it suppose to do that?  If not by
> design
> > > which is my suspicion, does anybody know what may be causing it?
> > >
> > > TIA
> > >
> > > Lino
> > > 93 90q sport
> > >
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