Just when summer is starting... The A/C decides to stop working... sigh...

Basically, the display comes on and you can change the temperature setting up and down, as well as the fan speed. However, other than changing the settings in the display nothing happens. Absolutely no air is coming out of any of the vents and the Aux Fan does not run either.

I tested the Aux Fan by removing the connector off the a/c pressure line while the car was running and while the A/C settings were set to high. That caused the aux FAN to come on and to spin at full speed. So it isn't the aux FAN.

I also connected INPA and also BMW Scanner 1.4, and these only reported an error for the AUC sensor.

I would appreciate it if anyone could help me with pointers of what to check next. I am thinking the a/c system has no "r134a" but I would like to rule out other stuff first before taking it to an A/C shop.

Thanks!

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2001 BMW X5 3.0i, Automatic, Gasoline