Answer to middle or side vents not blowing cold air.
I took it into a local shop who were doing recharge, cleaning the blower cage, and installing the cabin filter (I supplied it) for $12.50.....
After the check and recharge, it works like a charm now.
Had a Toyota 4 runner with the same problem and the recharge did the same thing.
So, the long and the short of it is, get the system checked and charged.


