Strong Draft in driver's footwell
 

Might be in passenger too but not sure.

Anyway at highway speeds, I can feel a strong draft coming down from near the ODB port area but more central.

Any ideas? I'm guessing previous owner removed a panel somewhere and never replaced it. AC on or off makes no difference.

Maybe you have a busted blend door actuator.

Maybe but the draft is definitely speed dependent. The normal vent AC and heater work fine.

did you check the cable bundle plug that goes through the firewall? also check the door weather seal strip

Will check for the cable bundle plug...

I wouldn't think it's the door strip because it's not coming from the side, it's coming from directly in the center area