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

[Jerry Scott]

The serp belt should not look worn.  When I took my belt off after the first 
70,000 miles, it looked good enough to put back on the car, but of course I 
replaced it.  If you are showing wear at low mileage, then you may have a 
problem with the compressor binding and causing too much drag on the belt. 
You might want to remove the serp belt and check the compressor pulley to 
see if it is binding or rough when turning.  From your previous statements 
regarding belt codes, I would suspect the compressor could be stalling the 
belt at times.  You will have to find a way to engage the compressor clutch 
when you are checking the pulley.

Jerry


----- Original Message ----- 
From: "Andrew B" <andrew.sb at gmail.com>
To: "Thomas R Green" <trgreen at comcast.net>
Cc: "s-car-list" <s-car-list at audifans.com>
Sent: Wednesday, June 30, 2010 4:21 PM
Subject: Re: [s-cars] A/C Cycling on/off


Well, I checked the belt and it looks worn, but not cracked.  My
receipt from the shop where I had work done includes a serp belt on
the list (and I was charged for it) so I assume it was done (part of a
complete head replacement).  It is tight without much play.

I checked the codes again today, same sporadic blocks, same sporadic
hard slip, and the 223 high pressure switch sporadic.  The new one was
22.5, high pressure 120x open.  The radiators do look clean and
healthy, with no holes or bent fins or dents.  Some debris, but not
much.  Nothing on the 52C graphics channel indicated anything.

Also, when I checked the engine temp channel 51C, it read 5o.  The
engine was not warm, but is that supposed to be in C or F or is
something screwy there?

-Andrew

On Wed, Jun 30, 2010 at 4:55 PM, Thomas R Green <trgreen at comcast.net> wrote:
> The sooner the better. If there is indeed a "hard slip" occurring even
> sporadically
> It means the belt is really bad or the compressor is headed for failure. 
> It
> could be
> making metal already; something you really don't want. You want to write
> down
> the code and then clear it to determine if the event still happens. If it
> is just the belt,
> that could be bad also since belt pieces can fly everywhere.
>
> Tom
>
>
>> -----Original Message-----
>> Date: Wed, 30 Jun 2010 09:45:27 -0400
>> From: Andrew B <andrew.sb at gmail.com>
>> Subject: Re: [s-cars] A/C Cycling on/off...
>> To: djdawson2 at aol.com
>> Cc: s-car-list at audifans.com
>> Message-ID:
>> <AANLkTil5WryjLfPL4uLqZGO2UXBpqgSzIGIsvdLp7enM at mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> 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.
>>>
>>> I would check operation of you aux fan (with A/C on) as a starting 
>>> point.
>>>
>>> Dave
>>>
>>>
>>>
>>> -----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
>>>
>>>
>>> into the drive I encountered some heavy traffic. As I shuffled along,
>>>
>>>
>>> the A/C kept cutting out. This has happened before, again in heavy
>>>
>>>
>>> traffic, and on a hot day. Later, after the traffic finally
>>>
>>>
>>> dissipated, the A/C nor Recirc buttons/icons would stay lit, no matter
>>>
>>>
>>> whether I stopped and shut the car off or not.
>>>
>>>
>>>
>>>
>>>
>>> When I got to my destination, I left the car until the next day, when
>>>
>>>
>>> I started it up and the A/C worked fine. A quick drive that evening
>>>
>>>
>>> with the AC on was fine. Finally, on the trip back to boston (with no
>>>
>>>
>>> traffic and slightly ~5* cooler temps) the AC worked the whole way
>>>
>>>
>>> home with no incident.
>>>
>>>
>>>
>>>
>>>
>>> Also, late in both drives, my CC cluster became hard to operate.
>>>
>>>
>>> Buttons near the top would not function, but lower ones worked OK.
>>>
>>>
>>> This doesn't seem completely related to the traffic problem, as I
>>>
>>>
>>> could press the snowflake button, but it turned right off.
>>>
>>>
>>>
>>>
>>>
>>> Any ideas? There didn't appear to be any overheating issues as the
>>>
>>>
>>> idiot light did not come on and the temperature never climbed off the
>>>
>>>
>>> fat line, although is did creep to the hot side of it. Could my CC
>>>
>>>
>>> head be overheating? Compressor clutch? There doesn't seem to be any
>>>
>>>
>>> additional noise although the car does drive somewhat more sluggish
>>>
>>>
>>> with the AC on.
>>>
>>>
>>>
>>>
>>>
>>> Would love to find a solution for this...the one place I want AC the
>>>
>>>
>>> most is where it habitually cuts out...
>>>
>>>
>>>
>>>
>>>
>>> -Andrew
>
>
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