CC head diagnostic only shows 12.0 volts

Mon Nov 12 12:05:48 PST 2012

 Now that would be true and I have been intending to remedy that so I should
be able to confirm that.

Thanks!
Ed

-----Original Message-----
From: Peter Schulz [mailto:p.schulz at verizon.net] 
Sent: Monday, November 12, 2012 1:00 PM
To: ed.kellock at gmail.com; Mike Miller
Cc: 200q20V mailing list
Subject: Re: CC head diagnostic only shows 12.0 volts

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) 