An update on what I found,
Opened the small electric motor running the temperature flap,
everything seems to be OK nothing stuck or damaged.
http://www.audi.auto.ru/climate/temp.../temp_flap.htm (shows how
its done)
Put it together again and test it, seems to still be stuck.
I dig out the control unit from the dash, open it and look over the
electronics (I work in electronics) nothing looks broken,
power the control up on the bench at work, all drivers for the motors
seems to be OK.
(I used serious lab equipment, you really want to know what you do when
attempting
this since it is expensive if you short something and breaks it (more)) )
hmmmm...
Then it should be the wireing to the motor.
All those (4 motors) are together in one plug to the control paired nicely.
I use an multimeter to check for 10-40ohm loads.
Everything seems still OK... (this last measurment was the first I should
have
done had I known what to look for, after checking the diagnostics display)
Since nothing seems wrong I put it all togheter. now it works very
nicely....
My guess is it was a bad connection in one of the connectors,
or secondary that the electric motor was slightly stuck but me messing with
it caused it to get better.
The motors can also be checked by applying 7V directly on the connector
near the blower (no dismantling). My guess is it will work nicely running
the
motor with a 9V small battery (like in smoke alarms) then afterwards,
the potentiometer for the flap should read something different from before
in diagnostics.
Found links to diagnostics from the control system after posting my first
request.
http://www.audiworld.com/tech/int5.shtml
diag code for errors was: 8.5 stuck temperature flap.
After powering it on the bench it desided all its sensors where
temporarily in error,
(disconnected) not so strange since the whole car was missing.
after a few days the error code is now 0.0 no errors... and it still
works. :-)
Got a responce from someone that had defective output drivers in the
control
unit, so apparently that can happen too.
Any problem with motor,wires,drivers, control of drivers that cause a
prolonged
missmatch between the pot reporting the flaps position
and the position the control wants to have will be reported as a stuck
flap.
I learned a lot, and I'm impressed what the diagnostics have information
about, and can figure out.
Thanks for all the help.
On Thu, 01 Jul 2004 21:47:18 GMT, dave smith > wrote:
> On Mon, 21 Jun 2004 19:41:57 +0200, kons > wrote:
>
>> Hi,
>>
>> My 96 A6 ventilation system acts funny,
>> I have the clima automat (AC system) with the digital control unit. (no
>> round knobs)
>>
>> It's like the flaps inside the fan housing gets stuck,
>> I have an exploded view printout from the local Audi shop... so I know
>> there are flaps inside but havent opened yet.
>> The levers on the outside of the blower are not moving when the settings
>> on the control unit is changed
>> and they feel like stuck (should they?).
>> I can hear there is a wrrrr wrrr sound like some small electric motor
>> tries to regulate the setting
>> (could be something else but thats what I think it sounds and feels
>> like)..
>> Have looked from the dashboard side (had the radio and AC control unit
>> out
>> anyway)
>> but could not see any obviuos links to control the flaps.
>>
>> Regulation by the fan speed control works (kind of) enough that I get by
>> but it would be nice to fix it permanetly.
>> Before winter anyway (I live in Norway) brrr in -20C its not nice
>> without
>> heating.
>>
>> Any hints what it can be?
>> Anyone seen this problem before?
>> I thought it would be hard to open the fan unit but it seems from some
>> posts I saw here
>> that exchanging the blower is at least doable so perhaps its not so
>> bad???
>> I will open it eventually I guess, but some hints along the way would be
>> nice.
>>
>> Thanks in advance
>>
>> PS the email is not a working one, allergic to spam...
>
> I have an A6 2.6 SE 1996
>
> For a time the rapid defrost function was not working. I could hear
> the fan going full speed but nothing coming out of the central
> windscreen outlet. Then it started to work ok but very little cold air
> was coming from the dash a/c vents. Now the dash vents are working
> but not the rapid defrost.
>
> Seems like a similar problem.
>
> Also had Ignition switch return switch go. This is really scary,
> Grinding noises from gearbox and lots of electrics not working.
> Glad to say new switch was just £25.00 and I fitted it myself.
> I understand this is a common fault on A6.
>
> Regards David.
--
Using Opera's revolutionary e-mail client:
http://www.opera.com/m2/