[s-cars] climate control issues

[Stott Hare]

Check the CC head fault codes first.  Most likely you will find that the
stepper motors controlling flap positions and temp control valve are shot.
It's common for the CC head to be sending out the right requests, but for
the other parts of the system to be unable to respond accordingly.

Temp control servo is on the side of the heater box in the plenum (near
wiper motor) inside a wipe plastic cover made from exceedingly brittle
plastic.  Expect several of the mounting points to shear off as you remove
the 8? Micro Phillips.
http://s-cars.org/postnuke/downloads/pdf/Temp%20Flap%20Servo%20Motor%20R&R.p
df

The floor/vent/defrost flap controls are more obnoxious to replace as they
are buried behind the center console.

Fan speed control?  If all speeds operate sometimes it may be the CC head.
If some speeds never operate, it's likely the resistor pack.  If the CC head
reports incorrect interior temps or coolant temps, it may be trying to
maintain set temp but based on faulty starting interior temps etc.

Again, start with the fault codes and then compare sensor values and flap
positions against expectation via the CC head diagnostic displays.  A
Bentley manual will give you the step by step tests and checks.

General FAQ:
http://forums.quattroworld.com/s4s6/msgs/15184.phtml

-Stott


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Patrick Moores
Sent: Thursday, March 11, 2010 3:43 PM
To: s-car-list at audifans.com
Subject: Re: [s-cars] climate control issues

Less urgent.... but is a perfectly normal CC unit supposed to be incredibly
difficult and ornery to live with and operate? I have no previous experience
with any other than the one that came with my 95 S6 but this thing has a
mind of its own....like it will give me heat to my feet whenever asked, but
I cannot get it to respond to the central position, and sometimes it refuses
to defrost the windshield, sometimes it won't go into auto and other times
it won't go out of auto,and other times I cannot get it to lower the speed
or temp when I return to my car after work when its 70deg inside but I had
the heat on in the morning when it was sub 40deg, so upon start up it blasts
heat at high speed for 20min when its already hot in the car....
I've purchased a used CC unit as a backup.....should I be swapping it out
and stop putting up with this stubborn unit that i have or is this thing
trying to operate as intendedc thinking it knows best....seriously, most of
the function it allows me to perform it does so grudgingly, do I get a new
CC unit or an exorcism?
(above description may contain slight exaggerations - slight)
 
patrick - blown away - moores
 
 
Message: 3
Date: Wed, 10 Mar 2010 21:20:40 -0700
From: Steve Mills <s.b.mills at gmail.com>
Subject: Re: [s-cars] climate control issues
To: ron kirkham <rkaudifool at gmail.com>
Cc: s-car-list <s-car-list at audifans.com>
Message-ID: <8106059E-D3A2-4995-BE2F-627920230B24 at gmail.com>
Content-Type: text/plain;    charset=us-ascii;    format=flowed;   
delsp=yes

The CC heads are functionally interchangeable. The only real difference is
the later ones have a redder display- early are more orange.

You can do fault detection through either the head or VAG-COM. You will need
V-C to clear the codes.

It sounds like you need a new blower motor in addition to cleaning the flap
motors, but you should be able to find out the cause once you have a good CC
head installed.



      
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