I reread your original post and you may have a few things going wrong here.
First you made mention that you cannot get air to come out of your dash vents...the ones that would blow directly at you right?
In that article picture #10 it shows a vacuum connector that is almost always the culprit for this problem of no vent airflow. Review that picture and find where yours is in your car. Than check to see if your vacuum connector looks like the bad example on the right of picture #10
So no airflow from the vents and airflow from defrost and floor only, indicates a bad vacuum connector 'nipple'
The air mix actuator only controls the blend door or you could say it controls the hot or cold. Not the direction of air flow.
Thirdly a blinking ECC display indicates a fault in the system as you probably figured out by now.
Most the time this blinking happens after the system loses power and the gear in the actuator brakes due to age and some other things involved.
However the air temp as you describe going cold then hot then back again could very well be a bad A/C controller.
You also said that there is airflow coming from the passenger side vents right?
If your getting air to come out of the passenger side vents and not the drivers side than this would also indicate a vacuum issue here.
First easy thing to start with Joe is to check all vacuum connections under the hood and at the vacuum tank found under the front right fender and bumper area.
Then from there look for that main A/C controller vacuum connector and take it apart to view the 'nipples'.....I know funny automotive term
Start with this and get back to us and tell us your findings.