[s-cars] climate control issue again

[Paul Heneghan]

Hello Forrest.

I used channel 01.  There are 50 or 60 diagnostic codes.  Those beginning
with 08 are to do with the Temperature Regulator Flap Motor, and so on.  See
Bentley or http://www.wak-tt.com/tt/climatecontcodes.htm for details.  The
12v.org site doesn't seem to be working at the moment.

Yes, you can use a VAG-COM instead.  You see different codes, but they give
the same information.

They are not particularly difficult to get to - but very fiddly.  There are
two behind the centre console, so the rear console, centre console, glove
box and driver's storage compartments all have to come out - very time
consuming.  Then, although the manuals don't say so, I remove the ducting
for the face vents for the rear passengers - makes it MUCH easier to get at
the tray with the actuators on.  Then four screws later, the tray comes out.
You have to lie on your back in the footwell and bang your head off the
steering wheel, pedals, etc.  Not the most comfortable job to do.

The temperature flap motor is supposed to be easy, but on UK spec cars
(RHD), it's impossible.  On US cars, you just remove the wiper motor to gain
access to the screws on the cover.  On UK spec cars, there are big chunks of
aircon in the way - I don't know what they're called - evaporator?  In both
my cars, I got to three of the four or five screws, and then discovered that
a previous owner had got that far, and then just snapped the remaining lugs
off!  I can't see any other way of doing it really.

The temp flap motor should be easy for LHD cars.

Set aside a weekend!

Paul
  -----Original Message-----
  From: forrest bradshaw [mailto:sola4est at yahoo.com]
  Sent: 06 October 2005 19:01
  To: Paul Heneghan
  Subject: Re: [s-cars] climate control issue again


  what channel did you use when you got these codes? can I use a vag com to
check them instead?  are the flaps/motors hard to get too?
  thanks
  Forrest

  Paul Heneghan <paul at heneghan.co.uk> wrote:
    I had problems with my CC head last month - turned out to be a blown
8.5V
    regulator, caused by a short circuit temperature flap motor. When I took
    the CC head apart, I noticed that all the plastic clips that hold the
facia
    to the switch circuit board had broken, allowing the facia and circuit
board
    to separate. Although in my case, the buttons still worked, this could
    cause the problems you describe.

    I started all of this, because I couldn't control the temperature at all
on
    both cars, and on one of them, I couldn't get any air out of the face
vents.
    I was getting some 08.5, 11.5 and 13.5 codes implying one or more
defective
    flap motors. I did both cars at the same time, so I serviced six flap
    motors in total. I had three flap motors that didn't work at all (one
being
    a short circuit, the other two were open circuit), one flap motor that
    needed a service, and two flap motors that appeared to be OK. Of course
the
    short circuit temperature flap motor had caused the regulator in the CC
head
    to overheat, and although the spec sheet for the L4940V85 8.5V regulator
    talks about thermal protection, it cooked itself.

    The only good side to all of this, is that I saved so much money fixing
all
    the motors and the CC head, that I bought myself a dual bench power
supply!
    I don't know how much CC heads are new, but they fetch quite high prices
    (GBP 50 - 100) second hand on eBay. Flap motor actuators seem to cost
from
    about GBP100 to GBP200.

    For those of you with unpredictable/intermittent air delivery and 08.5,
11.5
    and 13.5 error codes on the CC head, I've made a start on a write-up on
the
    process. It's not finished yet - I need to add a description of the
    regulators in the CC head with some pictures. It's at:
    http://www.eveshamsquash.co.uk/audi/climate.html

    Paul

    ----- Original Message-----

    Message: 2
    Date: Wed, 5 Oct 2005 16:34:55 -0400
    From: Matt Molyneux
    Subject: Re: [s-cars] climate control issue again

    I have the same exact problem from time to time now! The CC had done
this
    before maybe a year or so ago, but in the last month it has crept up
again
    and acts like this almost all the time. The one thing I have discovered
is
    if you hold a button that doesn't work, or kind of jam at it, sometimes
it
    registers and works (as if there is a bad contact back there). Other
than
    that, I often have to wait a long time for the buttons to mysteriously
work
    again, sometimes in a few minutes, sometimes a day later. It's really
odd, I
    hope there is a fix out there.

    On 10/5/05, forrest bradshaw wrote:
    >
    > the next day after the first issue the CC unit worked normal again,
but...
    > climate control again froze last night, only 3 buttons
responded. -temp,< BR>> floor vent and recirc button. it also rained last
night.
    > could there be a wiring issue or should I be looking for a new climate
    > control unit?
    > this is gonna get annoying if this happens all the time






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