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This is all good information and I believe it will require a thorough going over each part of the system. Great place to start!
To answer your questions, I am definitely referring to when I click the AUTO button and AUTO appears on the display. When I click the face vent button AUTO disappears from the display. That's when the issue occurs.
I think the first thing to do is probably to check for any hardware/parts problems issues. In this case, it sounds like I need to verify that the Aux water pump and interior temp sensor are up to snuff like you mentioned, among other things. Is there a simple way to test the heater valve itself or the external temp sensor. those are also part of the input system.
I checked BMW Scanner and I am in fact getting one code for the AUC. I remember trying to open that thing and clean it at some point and simply could NOT get it apart. I suppose I could just break it apart and duct tape it back until I got a new one if that's necessary.
let me try blowing out the interior sensor dust and testing the aux pump and i'll take another crack and the AUC and report back.
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2005 X5 3.0i - 71k mi (9.2018) -> 81k (9.2019) -> 100k (9.2021) -> 123k (8.2025)
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SOLD : 2003 X5 3.0 - 177k mi (9.2018) -> 186k (9.2019) -> 205k (9.2021)
SOLD : 1997 328is Coupe - Hellrot Red
SOLD : 1988 528e w/ Bullseye s256 / MS2 Extra / GC Coilovers / Yukon Coils ~ 300+ HP
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