When put my selector to windshield my ac turning on automatically

If that is the same thing as Defrost, the compressor will run even if the ac button is off. The compressor runs to dry the air blowing on the windshield.

Was the selector on "defrost" ?
It should pull outside air into the car and thru the ac and heater cores to both dry the air and warm it up.
Did you have excessive moisture inside the car, such as wet floors ?

you just need to replace the switch

motor mounts

You're jus going to have to take the unit apart and find what is binding up the cable or blend door. Maybe something in the blend door path, a toy or something that ha fallen in the ducts.

not one hundred percent on this but if it uses vacuum to control the selector doors then u may want to check your vacuum source and if there is vacuum u may want to have your control head tested.

The problem is probably a faulty diverter door actuator or vacuum problem at the HVAC plenum under the dash. This is a common problem - see YouTube for help diagnosing this:
https://www.youtube.com/watch?v=Nlt9A1sp-4U

your blower motor has gone bad and it over heats and shuts down

I may be able to help but, I need some more information. When you turned on your A/C what was the vent selector set at (Floor, Face, Defroster)?

Most newer cars with A/C systems have a built in setting when you set your vent selector to Defrost mode (blowing on the windshield) that automatically turns on the A/C unit. This is normal due to the fact that a fogged up windshield is from water vapor and the A/C does an awesome job of drying the air so it can more effectively and quickly remove that annoying water vapor from your windshield so you can see better while driving.

Try changing the vent selector to full face vent (the vents from the dashboard that you can adjust) and switch on/off the A/C and see if that solves your problem.

CHECK THE TEMPURATURE SETTING, SHOULD BE LOW TEMPURATURE.