all my heater vents work except for my defroster, air is hot all vents change but it won t switch to defrost,HELP1

 

Do You have navigation ? Thre are two settings that will blow air from the dash to the front window They are illustrated in the manual. You have to push the defrost button under the nav and if that is not enough to clear then adjust blower speed. If that does not work you may have a vent solenoid actuator problem