MAX A/C will also turn off "AUTO". It took me a while to figure how buttons worked. I'm still confused about the recirculation button. With in put from here, once it's cold I set it to the right light setting. I use fan speed to keep comfortable. If I let it at "Auto", I don't think it would reach 42F driving around town.

With a working fan, the CAN network probably has input to control temps and functions.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)