All air blows from defrost only,2003 ford taurus.I checked the air blend door motor seems to be working?

All air blows from defrost only,2003 ford taurus. I checked the air blend door motor seems to be working? - 1

The blend door regulates the temperature, not the direction. The mode door regulates the air's direction and is vacuum operated. While it could be the door or door actuator, most likely there's a vacuum leak. It can be difficult to trace a vacuum leak. The system gets vacuum from the intake manifold on the engine.
Try running the car for 5 seconds, shutting it off, and listening for any hissing sound. Check under the hood that the vacuum hose has no cracks or breaks.
The best way to trouble shoot this is buy a manual pump up vacuum gauge.
you can manually pump up the lines and actuators and see if they leak down.

there's a small vacuum line going into the firewall where the HVAC gets it vacuum. You need to track it down on the firewall side and check for cracked or visibly bad hoses. Replace as necessary.

from here, use the hand held vacuum pump to pump down the system and see if it holds vacuum, If it immediately leaks down, you need to find the leak and replace parts as needed.