[s-cars] climate control issues

Thu Mar 11 15:50:06 PST 2010

great notes from Stott.  and as pointed out, yes it is all supposed to work
well and they generally do until the servos or blower motor crap out, with
CC head failure being a distant but still not unheard-of third place.

the servo motors get clogged with brush dust but usually still
partially/intermittently work for a long time, showing symptoms as you
outlined - temp or outlets don't always give what you ask for but not 100%
failure.  when this happens you get codes so it's easily tracked down.
servos can be disassembled and cleaned to rehabilitate for free, not as good
as new obviously but enough to get you another year or more of life. worked
well for me for sure.

also back to the original post, if half the display is shot, it could just
be the LED but there's every reason to be suspicious something else (or
several something elses) has pooped the bed inside there as well.  do the CC
head swap, it's a 5 minute job, and even if it doesn't fix it, then with a
good display you can read the codes which will probably tell you servos are
getting gunked up etc.

> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Stott Hare
> Sent: Friday, March 12, 2010 5:12 AM
> To: 'Patrick Moores'
> Cc: 'S-Car-List at Audifans.Com'
> Subject: Re: [s-cars] climate control issues
>
> 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%2
> 0Motor%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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