Wife noticed the other day at minus 10 that the two vents in the centre of the dash are blowing cold air no matter what setting the knob is on- this has manual climate control I would assume some sort of flap or door is busted but any hints
Definitely try the air mix dial first. Typically when the blend door actuators are messed up (purely mechanical on a car with MCC) you'll notice a difference in both driver side or both passenger side vents, not just the center vents.
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