I was working on my X5 today and noticed what sounds like a low speed fan running even though the power was off. It seemed to be coming from behind the climate control panel. It is still going hours later. I'm afraid to go out in the morning and find a dead battery.

Thoughts?

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2005 X5 3.0i
2003 530i Sport (former)
2014 Audi A6 TDI Prestige (daily)
2018 MB C300 Cabriolet (wife's)