What is the cause of the heating/air direction switch not to work? on 1999 Toyota Camry

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
This is the switch that changes the air to go out the floor vents, the windshield vent (for defogging), etc. Mine stopped working. Won't change from dash vents!! Can't defog my front windshield.
(2) Answers
Qualified Local Toyota Shops
Qualified Toyota Shops For This Repair