What is a medium air conditioner

Air conditioning only cools the middle right nozzle

Hi Guys.

I know that there are quite a few threads on the subject of air conditioning. Since my error description differs a bit from the others, I opened a new thread. The problem for me is as follows:

When the air conditioning compressor is switched off (ECON mode), I have no problems with the air supply. The set temperature comes out of all nozzles. If I set cold on the right and warm on the left, then that works too. This also works the other way around.

The problems start when I switch on the air conditioning compressor. From this point on, the air supply from the right-hand center nozzle is considerably colder than that of all the others. Guided I would say that it is the only nozzle from which the air comes out that is cooled by the air conditioning system. The error was also checked together with a service employee from Audi.

To do this, the air conditioning compressor was switched on, the ventilation was switched to the air vents in the dashboard and the temperature was set to "LO". It was found that only the right of the middle nozzle cooled the temperature down to 8 ° C. Air at 22 ° C flowed from all other nozzles.

I have already had the car in the workshop three times because of the same fault. The phenomenon allegedly could not be reproduced at the first appointment. The second time it was stated that it had been fixed and that the error memory was empty. And when I picked him up again on Monday, I was informed that a basic setting of the air conditioning had been carried out. I should check myself whether the error has been eliminated. Of course he wasn't.

The whole thing is not really tragic in winter, but next summer is definitely coming. Unfortunately, my trust in the current workshop is also limited, so I don't really want to go there anymore.

My question to the pros here:

How can something like that come about? I had read about those who suffered, where a recirculation flap in the dashboard was replaced, which was associated with costs well over 1000 euros. Is such an error an option for me? Why does the error only occur when I switch on the air conditioning compressor?

I am grateful to everyone for tips and advice and I wish you a good and accident-free journey through the (hopefully soon) coming winter :)

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12 answers

Unfortunately I can't tell you why. For me it was the right outer nozzle that did not want to heat. Cold in winter, so the other way around. But they managed to do something with me, swapped something. Was on guarantee, and according to internal accounting with Audi not that expensive ...

I have now been to the workshop three times for the same fault without anyone being able to find the fault. First of all, I turned to Audi customer service because it cannot be that I had to leave the car in the workshop three times for a whole day without being able to find a fault. Especially if you are sent home with the words "Take a look and see if it works" on the last try. So you were not able to perform a function test within 8 hours. : - /

Can you perhaps go back to your workshop to find out what caused the mistake in you at the time? Or maybe you still have the invoice or the repair receipt? With that you would help me extremely ...

In between, I'll first make an appointment in another workshop ...

I should have done it earlier, after they had to make four appointments to get the problem with the tailgate under control. I'm really pissed off at Audi at the moment!

Just again briefly to understand: Compressor ON, temperature to "LO" (i.e. maximum cooling capacity) and air distribution only to the 4 vents in the dashboard means that only the right of the middle vents cools as desired? Is that the mistake?

Try to isolate the problem yourself:

- What happens if you change the air distribution to above or below?

- What happens when you switch to air circulation?

- Shine a flashlight in the middle air outlet: if you now adjust the air supply there, do you see how two flaps turn in each air outlet?

- What happens if you set the temperature to "HI" while the compressor is running?

- If you set the basic setting towards "colder" or "warmer" in the MMI for the middle air vents, what happens to the temperature?

- Do you have a two- or four-zone climate?

For the workshop as basics:

- Has the workshop checked that there is enough refrigerant in the circuit?

- Are all pressure values ​​specified by Audi correct on the high and low pressure side?

- Is there any leakage? Has contrast agent been added and was there a UV search for leaks?

- Have all the servomotors been moved from end stop to end stop?

- Have the heat exchangers been checked (pressure / temperature)?

The air conditioning in the A8 (similar to an airplane ...) is definitely one of the most complex systems in the vehicle; Some even claim that it is more complex than the engine ... If a workshop has no idea about it, they cannot repair anything properly and search for errors for days without success. It is precisely for this reason that Audi provides very good diagnostic options and very good guided troubleshooting for the air conditioning system. It is incomprehensible why the workshops do not use it. How many A8s "sees" your workshop per year? How often do you repair air conditioners? At most you should switch!

Greeting

stamino

Hi Stamino.

Many thanks for your response. I got back in the car yesterday to answer all the questions:

- What happens if you change the air distribution to the top or bottom?

The problem persists here too ...

- What happens when you switch to air circulation?

Here, too, the same misery ...

- Shine a flashlight in the middle air outlet: if you turn on the air supply there, do you see how two flaps turn in each air outlet?

Both flaps work perfectly (as far as I can see). You can open or close completely.

- What happens if you set the temperature to "HI" while the compressor is running?

With "HI" nice warm air comes out everywhere. Here I don't notice a clear difference when I feel it by hand. I think that warm air comes out equally everywhere.

- If you set the basic setting towards "colder" or "warmer" in the MMI for the middle air vents, what happens to the temperature?

I can't really tell any real difference here. If it gets warmer or colder, then so minimally that I can't "feel" it with my hand.

- Do you have a two- or four-zone climate?

Got the 4-zone climate. The problem also occurs with the rear nozzles. Right gets really cold, left only moderately. This is clearly noticeable when I hold my hand in front of the air outlet ...

For the workshop as basics:

- Has the workshop checked that there is enough refrigerant in the circuit?

- Are all pressure values ​​specified by Audi correct on the high and low pressure side?

- Is there any leakage? Has contrast agent been added and was there a UV search for leaks?

- Have all servomotors been moved from end stop to end stop?

- Have the heat exchangers been checked (pressure / temperature)?

I don't know whether the workshop carried out all of this. But since you weren't even able to check whether the error was still there before I picked up the car last time, I dare to doubt it :-(

I will definitely bring it up in the new workshop. In any case, I thank you for your help and I will keep you updated on how this works out ...

Above all, I will point out the possibility of guided troubleshooting to the workshop. It's really sad that they don't know that themselves: - /

Hello,

According to your description of the error, I would have the following checked:

1) move all servomotors of the system from end stop to end stop

If OK:

2) test all climate temperature sensors for plausible signals (intake duct and all vents)

If OK:

3) Test the function of the air conditioning compressor (PWM signal, pressure, HP switch, LP switch)

If OK:

4) Test / top up the refrigerant quantity (attention: there are different fill quantities depending on the year of construction, type of system and built-in compressor)

If OK:

5) Test the entire system for leaks with UV

If OK:

6) Check air distribution box including recirculation flap and back pressure flap

If OK:

7) Check the heat exchanger

If you have exactly one nozzle that is cooling, I guess something has to do with the air distribution / mixture. 1) -3) a good workshop can test without loosening a screw!

Greeting

stamino

Sooo ...

After the stress "between the years" my "old" dealer sent me an invoice for 65 euros. According to the description for the "guided troubleshooting" and the installation of new software for the air conditioning ... 65 euros are not the world , but I think it's just damn outrageous to ask for money for it. Especially when you consider that after the last visit I was said goodbye to "see if it's possible ..." ...

Tomorrow I'll make an appointment with another dealer ...

Does anyone know a good workshop near Gießen, which may be particularly familiar with air conditioning? Would be ready to drive a little further for it ... The main thing is that the system will work properly again by summer, because I want to go on vacation by car ...

Thanks to the forum and especially to stamino and subsequently a Happy New Year to all of you :-)

If you are interested, I will of course be happy to keep you informed about the problem ...

Quote:

Originally written by X30XE

Sooo ...

After the stress "between the years" my "old" dealer sent me an invoice for 65 euros. According to the description for the "guided troubleshooting" and the installation of new software for the air conditioning ... 65 euros are not the world , but I think it's just damn outrageous to ask for money for it. Especially when you consider that after the last visit I was said goodbye to "see if it's possible ..." ...

Tomorrow I'll make an appointment with another dealer ...

Does anyone know a good workshop near Gießen, which may be particularly familiar with air conditioning? Would be ready to drive a little further for it ... The main thing is that the system will work properly again by summer, because I want to go on vacation by car ...

Thanks to the forum and especially to stamino and subsequently a Happy New Year to all of you :-)

If you are interested, I will of course be happy to keep you informed about the problem ...

Hello I have the same problem if you have the problem out of the world please for a solution. thanks

Hello

I would like to know how high the outlet temperature of the climate is with you.

I had an air conditioning service done today.

Evaporator 4 degrees, outlet air nozzles in the dashboard 5-6 degrees.

Are the values ​​okay or should it be colder?

Greetings, Jens