A few months ago, my 99' RX300 stopped switching the flow of air from anywhere but the vents. Even when I push the button to switch to front defrost, floor, floor/vent, defrost/floor, etc, the air continues to only blow from the vents. The adjustable fan speed works fine, as well as the heat and A/C, but it does not respond to changing the direction on the dash. Even when put on floors only, the vents continue blowing. Also, and i'm not sure if this is directly related, but just recently another