Air conditioner not cooling during speed fluctuations

Hello,

I'm having a problem where the air conditioning stops cooling when the engine speed increases.

Seat Exeo, year 2010, 2.0 diesel engine, 143 horsepower.

The following actions were taken:
- Error memory is empty.
- Air conditioning service was performed.
- The two fans on the condenser are running / do not run when in ECO mode.
- Compressor current, according to VCDS, is between approximately 0.3 and 0.65 A.
- High-pressure generator (G65) idling pressure: 10 to 14 bar.
- The high-pressure fuel injector (G65) is not delivering the required pressure (6 bar) when increasing engine speed.
- Last shutdown condition 1.0 (according to VCDS).
Notably, the compressor draws 0.65 amps, but the pressure is not reaching 6 bar.
Does anyone know where the problem might be?

Xbuman wrote:

- Last shutdown condition 1.0 (according to VCDS). Notably, the compressor draws 0.65 amps, but the pressure is not reaching 6 bar. Does anyone know where the problem might be?

What does VCDS display as the explanation for "deactivation condition 1"?

If the compressor is powered on but not building pressure, it's likely seized. It's probably triggered the clutch. In case of a fault, record a video from the front side using your phone. That usually provides quite a good amount of information.

If everything is okay, I would check whether the current is actually flowing (by taking a measurement with a multimeter), or whether the control unit (STG) just wants the value to be a certain level (a pure setpoint value)...[/quote]

Thank you for the quick response.

The term "compressor current" refers to the control valve N280, which is specifically for the compressor.
According to VCDS, the compressor torque drops to 0 Nm when the engine speed increases, and then rises to approximately 5-9 Nm as the engine speed decreases.

Is the compressor's impeller intact?

The take-up disc is fixed, and the compressor is not blocked.

guste100 wrote:

Xbuman wrote: - Last shutdown condition 1.0 (according to VCDS). Notably, the compressor draws 0.65 amps, but the pressure is not reaching 6 bar. Does anyone know where the problem might be? What does VCDS display as the explanation for "deactivation condition 1"?

Please answer our questions if you want us to help you.

Okay, I understand. Please provide the German text you want me to translate into English.
The compressor only has one connection, likely for the control valve N280.

The control valve is available as a separate part. However, I recommend replacing the entire compressor. Of course, this also includes the dryer.

The master also suspected that the problem was related to the compressor.
But why should the dryer be included?

Xbuman wrote:

But why should the dryer be included?

Because the circuit has been opened and the dryer is becoming saturated with moisture.

What kind of compressor do you have installed?

The compressor and the dryer were replaced.
The high-pressure sensor (G65) now displays a minimum of 7 bar, and depending on the power output, it can increase to 13 bar. Simultaneously, the compressor torque increases with the pressure. The pressure sensor G65 now displays how the pressure is slowly increasing and decreasing, instead of showing abrupt bar values.
The compressor is also automatically switched off for a few seconds when the accelerator pedal is pressed hard, in order to maintain engine power. According to the Seat manual.

Compressor number: 4F0 260 805AP.

Thank you for your support.

I'm glad the feature is working again. Who performed the repair?

A small, reliable workshop. Compressor, dryer, and total labor costs: approximately 750.
The mechanic was either unaware of the issue related to climate control and engine speed, or unable to fully correlate the VCDS readings, but his assumption was correct.
I'm glad I have VCDS; it's already paid for itself.