Hello, I need some help with my 06 MCS, I have the Auto Climate Control System, and whenever I turn it on I can only get air to come out of the defrost vents and the floor vents but none out of the face vent. There is a whistle whenever I select the face vents.
I have already tried replacing the Air Distribution Actuator. Please Help

 

Sounds like a vacuum line has disconnected from the A/C Control …

 

I have looked for loose hoses or any unplugged things. But I couldn't find any. I am stuck.

 

If you have access to a smoke machine , it might help you find the source of the vacuum leak …