Thanks. So far I can tell the mechanical knob in the center vent makes a change as the airflow sound varies when I move the knob from red dots to blue.


I had a Foxwell but lent it to a friend who lost it. I have an IR thermometer, so I'll give that a look. The footwell air is getting hot, so I don't think it's an air bubble.


The fun continues. And by fun I mean that this issue is bracketed by a frozen CCV that made the engine barf oil everywhere. Intake came off to fit a new Febi 'cold climate' CCV system along with rodding out the dipstick CCV drain.

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'04 X5 3.0 5AT with 300,000+km - Black
'08 535xi 6AT with 290,000+km - Titanium Silver