What do when your car ac switch was free?(not working and run freely)

Are you trying to say that the switch does not activate the blower motor for the AC? If so, you first need to check for a blown fuse. If the fuse is ok, check to see if you have 12 Volts coming into the AC switch and out to the blower motor, you will need a wiring diagram to identify the wires. That will eliminate two possible causes for the problem, the fuse, and the switch. Beyond that, you will need a service manual for the specific make and model of the vehicle.