Touran: Klimaanlage kühlt nicht | Posts 16+

@T3Surfer:

Is there a way to test this while it's still installed? Or, in other words, can I test it without opening the system?

a) "bridge" and set the compressor to maximum power.
b) Can I change it without emptying the refrigerant?

There are even testing devices to test the control valve! But it requires some brainpower.
completely unnecessary, I mean.
If there's a cable break or something like that, there would be an error in the memory! (Try unplugging the compressor - you'll immediately see an error in the memory!)
Very often, there is no fault; provided that there is sufficient refrigerant!
Your climate control is only cooling very slightly due to a faulty regulating valve, which means: the compressor is working properly! It would be different if the evaporator temperature were as warm as the intake air; then there would be a refrigerant leak or the compressor's safety torque coupling has disengaged. You can see this when the engine is running and using a dental mirror – the inner disc will not rotate.
To replace the pressure relief valve, refrigerant must be evacuated.

Hello T3Surfer,

That makes sense.
I once measured the PWM signal. It seems to be correct. It's at 500 Hz with varying amplitude levels, depending on the control method.
Please provide the German text you would like me to translate into English.
Here's the translation:

"What exactly does a control valve do? Is that different from controlling the compressor's swashplate? And does my Touran even have its swashplate controlled?"