My CC doesn't put airflow out of any vents even when I have the temp set to HI and the fan speed all the way up. I can hear the fan blowing (so the blower motor is good) but its as if all of the vents are closed - no matter what the airflow selector says.

Any ideas??

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE