[s-cars] A/C Cycling on/off...

[Andrew Beckert]

Overcharging will also result in the high pressure switch kicking off the
compressor in traffic and other heat soak situations.  These were the
symptoms I experienced, so make sure whoever evacuates and recharges your
system knows exactly what they are doing.

Andrew

On Wed, Jun 30, 2010 at 1:26 PM, <djdawson2 at aol.com> wrote:

> Low refrigerant will usually keep the compressor for engaging for anything
> more than a few seconds.  A system that runs and kicks off is typically
> suffering from a lack of airflow, resulting in high system pressure cut-off.
>  This could be the aux fan, a weak fan clutch, a radiator and/or condenser
> packed full of bugs and debris, or bent fins on either or both the rad and
> condenser.
>
> If it cuts out routinely, I would be trying to determine if it is the high
> pressure switch that is turning things off.  Based on what you've said about
> traffic and heat, it seems to me that this is most likely the case.
>
> Dave
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> -----Original Message-----
> From: Andrew B <andrew.sb at gmail.com>
> To: djdawson2 at aol.com
> Cc: s-car-list at audifans.com
> Sent: Wed, Jun 30, 2010 7:45 am
> Subject: Re: [s-cars] A/C Cycling on/off...
>
>
> Well, I checked my Aux fan this morning and it does indeed turn on
>
> with the AC.  I have heard before that low refrigerant could cause the
>
> problem, on QW, but it was more in passing than a "Here's your
>
> answer".  I have heard the afterrun pump turn on before, but not
>
> recently.  I'll keep an ear out for it in the future.
>
>
>
> I also checked the codes, and the only thing I really found was a
>
> "Belt slip, Hard, sporadic" that would indicate any compressor issue.
>
> Maybe I'll try and get over to an AC shop for a check and refill...
>
>
>
> On Tue, Jun 29, 2010 at 4:28 PM,  <djdawson2 at aol.com> wrote:
>
> > Keeping the CC cluster out of the equation for now.... I would suggest
> that
>
> > if your A/C is cutting out while in traffic or going slow, that your aux
> fan
>
> > is probably failing to operate.  This means inadequate airflow, resulting
> in
>
> > high system pressure, and eventually cut-out due to high pressure.
>
> >
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> > I would check operation of you aux fan (with A/C on) as a starting point.
>
> >
>
> > Dave
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> >
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> >
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> >
>
> > -----Original Message-----
>
> > From: Andrew B <andrew.sb at gmail.com>
>
> > To: s-car-list at audifans.com
>
> > Sent: Tue, Jun 29, 2010 1:41 pm
>
> > Subject: [s-cars] A/C Cycling on/off...
>
> >
>
> > The other day I was driving my 95.5 S6A from Boston to CT, and shortly
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> >
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> > into the drive I encountered some heavy traffic.  As I shuffled along,
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> > the A/C kept cutting out.  This has happened before, again in heavy
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> >
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> > traffic, and on a hot day.  Later, after the traffic finally
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> >
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> > dissipated, the A/C nor Recirc buttons/icons would stay lit, no matter
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> > whether I stopped and shut the car off or not.
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> > When I got to my destination, I left the car until the next day, when
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> > I started it up and the A/C worked fine.  A quick drive that evening
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> > with the AC on was fine.  Finally, on the trip back to boston (with no
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> > traffic and slightly ~5* cooler temps) the AC worked the whole way
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> > home with no incident.
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> > Also, late in both drives, my CC cluster became hard to operate.
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> >
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> > Buttons near the top would not function, but lower ones worked OK.
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> >
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> > This doesn't seem completely related to the traffic problem, as I
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> >
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> >
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> > could press the snowflake button, but it turned right off.
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> > Any ideas?  There didn't appear to be any overheating issues as the
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> > idiot light did not come on and the temperature never climbed off the
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> >
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> >
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> > fat line, although is did creep to the hot side of it.  Could my CC
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> > head be overheating?  Compressor clutch?  There doesn't seem to be any
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> > additional noise although the car does drive somewhat more sluggish
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> > with the AC on.
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> > Would love to find a solution for this...the one place I want AC the
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> > most is where it habitually cuts out...
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> > -Andrew
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> >
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> >
>
> > _______________________________________________
>
> >
>
> >
>
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