Potentiometer, Servo motors, Air conditioning system, Audi A6 C4, defective?

Hi.

On my C4, the Climatronic is no longer working. Specifically, both of the motors for the interior air distribution and the motor for temperature control are defective. "The errors listed are always the potentiometers (potis), even though I have reset the basic settings using VAG-Com."

Now, for example, I have opened the (the part for temperature control), removed the coal dust, cleaned the anchor bridges with a needle, and reassembled everything. The gears are smooth, and when directly powered with 6V, the motor runs smoothly in both directions.

Despite this, I am receiving the error message "Potentiometer value implausible."

If I then perform the home position travel with the lifting motor still running, I don't even see the motor's attempt to move, and the value displayed during the home position travel doesn't change either.

Is the potentiometer itself defective there? Does the error occur occasionally?
What values should the potentiometer output? Then I would measure it separately and individually.

Are there any other potential error points?

As the winter approaches, it would be nice if at least the climate control system worked .
So far, only the Staudruck valve is functioning...

Greetings

Ohweh, sounds like it could be a problem with the clutch... it happens quite often! Symptoms: The engine doesn't move when the clutch pedal is depressed.
:PCheck: Are all safety measures okay? If yes, proceed to the control motor with a multimeter during the actuator diagnosis to measure if voltage is present. If not ----> Control unit is defective
The simplest way would be if someone could lend you their spare part for testing.

Hi.
I don't know the error anymore, but does it also happen that another of the actuators fails, for example, the throttle valve?
I'm looking for someone who can lend me their replacement part, as it's usually pretty easy to swap it out.
Thank you in advance.
Greetings

Quote:

I don't know the exact cause of the problem now, but does it also happen that another of the actuators fails? (Specifically, the throttle valve)

Yes!

Quote:

I'm just looking for someone who can lend me their replacement part, it's probably just a simple swap.

Is very easy to expand! Unfortunately, I don't have one lying around .

Wanted to inquire - since I'm having the exact same problem - whether it was really the climate control unit?
I am currently ordering a "new" used part, number 4A0 820 043 K. At these temperatures, it's not a luxury if the heating works, because, for example, frozen/fogged-up windows will take forever to defrost otherwise!
"When performing a basic scan with VCDS, it takes approximately 5 seconds for all values to return to zero. Initially, the values fluctuate between 109 and 70. After 5 seconds, all values are zero, and the engine does not move. No voltage is detected at the temperature sensor connector."
Since then, the filter access panel (the one on the fan that is very easily accessible?) has also stopped working for me.

Furthermore, I am still receiving a "Coolant Sensor" error (in addition to the fact that all 4 pumps are no longer working) via VCDS.
The temperature of the water in my system rarely reaches 90 degrees, and even more rarely reaches that temperature consistently. (which could explain the slightly increased consumption).
Is this the thermostat? Is it easy to remove, without having to remove the cooler etc.?
Is there a corresponding thread for this?

Hi, Oli

Oli_B wrote:

Is this the thermostat? Is it easy to remove, without having to remove the cooler etc.?

Tell me about which engine it is, then I'll also tell you how it works.

TDI-GTI-4-Motion wrote:

Is this the thermostat? Oli_B wrote: Is it easy to remove, without having to remove the cooler etc.? Tell me about which engine it is, then I'll also tell you how it works. Please, tell me about the engine first, then I'll also tell you how it works.

Okay, my Audi's engine: 4.2 V8, Type 4A (Year: 94-97), with Xenon headlights, without a built-in heating system.
Thank you.

Oli_B wrote:

Is this the thermostat? TDI-GTI-4-Motion wrote: Oli_B wrote: Is it easy to remove, without having to remove the cooler etc.? Tell me about which engine it is, then I'll also tell you how it works. Please, tell me about the engine first, then I'll also tell you how it works. Okay, my Audi's engine: 4.2 V8, Type 4A (Year: 94-97), with Xenon headlights, without a built-in heating system. Thank you.

In contrast to the V6, the V8 does not require the timing belt to be removed. Therefore, the radiator can remain in place. The engine is actually quite straightforward, but everything is a bit tight.

Hey, first of all, HAPPY NEW YEAR!
And thank you for the notification, I feel reassured and can now hopefully handle the matter myself.