Touran AC Not Working: Troubleshooting & Repair Data

Hello,
The Climatic/air conditioning system in my 2006 Touran 1.9 TDI is no longer working.
The equipment had already been refilled with new material at the workshop, but that didn't help.

Now, I would like to record data from the control unit, and I want to...
"Please inquire beforehand about which data will be used for the analysis/statement."
"It's important to identify which data points can be recorded and are relevant. You can only record a maximum of 12 values simultaneously, I believe. Could you provide some tips for analyzing this data? The status of parameters like 'eco' (on/off, etc.) is clear, but which values might indicate a fault condition? The error memory was empty."
The fan does not run when the Climatic system is turned on. However, the fan runs when the control valve is activated using the diagnostic function.

But let's get back to the values:
Sure, here's the translation:

"e.g., Nm compressor, speed, etc."

Sure, here's the translation:

"Thank you in advance."
Frank.

Hi.

Compressor not turning on?

Is the printer currently in use?

Have you tried bridging the pressure switch yet, just to see if it's stuck?

Rüdi wrote:

Hi Compressor not turning on? Is the printer currently in use? Have you tried bridging the pressure switch yet, just to make sure it's not stuck?

Hello,
First of all, thank you for the response.

- The VCDS software displays the compressor's RPM and load in Nm... but what does that mean? Is it running? At what values can you determine this? What should I record?

- The pressure is 5.4 bar.

- No, nothing has been bridged yet.

I would like to initially collect the data using VCDS and see what it shows.
whether anything can be recognized from it yet. Therefore, what measurement values are available?
relevant?

Regards,
Frank.

In the Climatronic system, the on and off conditions should be displayed as bits. Hovering the mouse over the display will provide an explanation of each individual bit.

Here's why the compressor might be switched off. If everything else seems okay according to the diagnostics, you should check the compressor's power supply. If the compressor is receiving power, but there's no pressure difference being generated, then the compressor itself (or the impeller/clutch) is likely faulty.

Greetings.
Guste.

5.4 bar doesn't sound like a running compressor.


Log the following:

- Current flow to control valve N280 [%]
- Outlet temperature of the evaporator.
- Control of fresh air blower V2 [%]
- High-pressure source [bar]
- Outdoor temperature, G17.
- Motor speed
- Compressor torque

Thank you... I will log the values again according to the specifications later today.
Here are some values that I logged last week:
13:45:45
0.0 Compressor shutdown condition.
0.815 A Compressor current (actual value)
0.820 A Compressor current (setpoint value)
1000 revolutions per minute (RPM) - Compressor speed.
1.3 Nm Compressor load.
5.2 bar Refrigerant pressure (G65)
10.0% Cooler fan speed (actual value)
0.0% Cooler fan speed (setpoint).
66.0°C Refrigerant temperature.
24.0°C Temperature Outlet.
23.0°C Temperature sensor, evaporator (G308)

Okay, so my preference would be for a complete log file, not just individual entries.
What you can clearly see from your values is:

She wants to achieve maximum cooling (with the set current), but the compressor load is not appropriate. It should be around 10 Nm during cooling. The pressure is more like the idle pressure. So... create a diagram and continue searching.

I would tend to suspect a faulty pulley.

guste100 wrote:

If the compressor is powered on, it is (or the disc/clutch) faulty, unless a pressure difference is created.

brezelmann01 wrote:

Generally, I would be looking at a defective pulley right now.

I would also say: The control system is working correctly. The compressor is not cooling. Please inspect the pulley; you will probably see "rubber debris."

Greetings.
Guste.

Hello everyone,

Thank you again to everyone who helped with the answers and information.
haben. Ich habe nun einen neuen Kompressor gekauft (Sanden). The part has...
einbaufertig 250 €Euro gekostet und die Befüllung 59€uro - der Einbau 70€uro. Alles in allem eine relativ günstige Reparatur mit Neuteil. Die 1ste Filling
"It wasn't even calculated for analysis. Anyway, your prediction was exactly right - except the computer crashed. Nowadays, it's important to form your own opinion about damages to avoid falling into the trap of some unscrupulous companies... A competent forum and a workshop that knows you are truly valuable."

Have a nice weekend!
and until next time.
Regards,
Frank.

Thank you for your feedback!