1996 Porsche 911 Carrera AC only blows from one vent

Heater problem
1996 Porsche 911 Carrera Two Wheel Drive Automatic 40000 miles

Just recently AC in my car now only comes out of the driver's vent by the door. Hot air comes from all the other vents, defrost, feet and center console.

The 2 slider dials to direct airflow seem to have little affect, and the temperature dial the same.

But when turning on the AC is does come out the one vent on the far left, drivers side, but none others. Ideas?

Tx, Bruce