Thanks for the helpful responses guys. I wasn't sure how to begin a search but you steered me in the right direction. I dug around for threads and found a few, usually regarding leaks. The cabin seems to heat up just fine, so I'm wondering if there is any risk of damage to anything with this component "disconnected" by the broken wire? I intend to fix it, but if I have until winter to get to it I will take my time and plan other work to go with it. I still am surprised there is no error message. Thanks again.

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2006 X5 4.8is
LeMans Blue over black
Style 168 rims
Blackout grills and hood vents
Aux jack