Just checking back into this.

Coolant was about a liter low, topped off. Bled the system. Seems better, but temps also haven't been below 0ºF like they were, so I can't be sure.

Shop also said I should be keeping the stratified air dial all the way to the 3-red dots and dialing back to cool it off, since all it really does is mix in some fresh air. I was under the impression it should be kept in the middle as a default and adjusted either way...

Regardless, it seems better, but temps are also much more mild. Haven't had any snow/cold to really tell if it's taken care of and if the defrost can keep up. Time will tell at this point. I'll be in touch.

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• 2008 X5 3.0si Alpine White