CC head diagnostic only shows 12.0 volts

[Peter Schulz]

Channel 11 showing solid 12.0 usually means that there is insufficient refrigerant in the AC system to engage the compressor.

-Peter Schulz
Chelmsford Ma, USA
http://www.naaclub.org/

1995.5 S6 Avant Emerald/Ecru
1995.5 S6 Avant Silver/Platinum
1991 90Q 20v Q Red
1991 90Q 20v Indigo
1991 CQ silver  (eS2 recipient) 

On Nov 3, 2012, at 3:00 PM, 200q20v-request at audifans.com wrote:

> 
> 
> Today's Topics:
> 
>   1. Re: CC head diagnostic only shows 12.0 volts (Mike Miller)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Fri, 02 Nov 2012 20:51:30 -0600
> From: Mike Miller <mikemilr at blackfoot.net>
> To: 200q20v at audifans.com
> Subject: Re: CC head diagnostic only shows 12.0 volts
> Message-ID: <509486B2.8040209 at blackfoot.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> I had a 200q that read a flat 12.0v on the CC head. It read normal 
> battery voltage on the terminal under the hood and at the battery. I 
> don't believe the splice is part of the issue.
> 
> I drove it at least 50k miles with no problems and I didn't worry about 
> it. I agree it is a handy tool to be able to watch how much the voltage 
> drops when the fan comes on or you turn on the headlights and high 
> beams. But, my other vehicles don't have that handy tool so I never 
> wanted to spend time chasing it.
> 
> --mike
> 
> On 11/2/2012 11:36 AM, Pete Bergin wrote:
>> Rethinking all of this, if it has been much over 120k on your regulator/brushes they could be getting a bit week.
>> Pete
>> 
>> 
>> -----Original Message-----
>> From: PeterBergin <PeterBergin at aol.com>
>> To: ed.kellock <ed.kellock at gmail.com>; 200q20v <200q20v at audifans.com>
>> Sent: Fri, Nov 2, 2012 6:45 am
>> Subject: Re: CC head diagnostic only shows 12.0 volts
>> 
>> 
>> I suppose you could study the wiring section in the Bentley and see where
>> the feed for the measurement comes from and start taking reading upstream
>> until  you find a connection that might be a bit week or get a use AC head,
>> plug it in  and see if you get a different reading.
>> 
>> Don't worry soon something more important on the car will need attention
>> and keep you busy!
>> 
>> Pete
>> 
>> 
>> In a message dated 11/1/2012 10:11:27 P.M. Central Daylight Time,
>> ed.kellock at gmail.com writes:
>> 
>> I agree with your  point, to a point... I wouldn't be quite as fixated on
>> this if it hadn't just  occurrred.  And the fact that the reading is static
>> at 12.0.  I know  and have known for some time that the reading won't be
>> accurate and correct,  but it has always been relevant, i.e. a useful indicator
>> of system status,  readily available, without stopping or getting out of the
>>  car.
>> 
>> 
>> Ed
>> 
>> 
>> -----Original Message-----
>> From: PeterBergin at aol.com  [mailto:PeterBergin at aol.com]
>> Sent: Thursday, November 01, 2012 7:04  PM
>> To: ed.kellock at gmail.com; 200q20v at audifans.com
>> Subject:  Re: CC head diagnostic only shows 12.0 volts
>> 
>> 
>> My old Avant was always 13.5-13.8 at the jump post and similar at the
>> battery post (eliminate the possibility of a splice problem).  The AC  head
>> channel 11 was always ~11.8-12.5 and fluctuated allot depending on the  load
>> ware as the dash gauge was more constant.  Never changed much over  10 years
>> and 240k miles.  Several brush/reg packs replaced and a re-man  Bosch alt.  I
>> would not worry about it.  My old 5000 was the  same.
>> 
>> Save your worries for the bigger $$ stuff!
>> Pete
>> 91 Avant sold to Drew and brought back to life!
>> 02 S6  Great car same game!
>> 
>> 
>> In a message dated 11/1/2012 12:07:23 P.M. Central Daylight Time,
>> ed.kellock at gmail.com writes:
>> 
>> And I have  13.6 at the jump start post and the dash gauge reflects that  as
>> well.
>> 
>> 91 200q20v Avant with 248k.
>> Threw the alt belt two  days ago.
>> I punched up the volt reading on the cc head and it was still  over 13 volts
>> when I got home and shut it down.
>> I installed a new belt  yesterday and the IC gauge is fine, but channel 11
>> only shows 12.0 and it  doesn't change.
>> I googled for an hour last night and couldn't find any  info.  I know I've
>> seen it mentioned in the past at some  point.
>> I'm going to dive into the manuals now.
>> Just a quick post in  case anyone's got a quick  answer.
>> 
>> Thanks!
>> Ed
>> 
>> 
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> End of 200q20v Digest, Vol 108, Issue 3
> ***************************************

-Peter Schulz
Chelmsford Ma, USA
http://www.naaclub.org/

1995.5 S6 Avant Emerald/Ecru
1995.5 S6 Avant Silver/Platinum
1991 90Q 20v Q Red
1991 90Q 20v Indigo
1991 CQ silver  (eS2 recipient)