After investigating for a minute , playing with the selector switch , that the only thing not working was the front defroster? It blows out of the vents and at my feet. When the switch selector is in the defrost position it blows at my feet? Any help would be greatly appreciated. Thank you.
If the reset fails to correct the problem, the part numbers for the mode selector actuator are:
GM # 15844095
As I recall, this actuator is on the passenger side kinda above and left of the glove box. It can be replaced without removing the dash. Can't recall if I had to remove the glove box.
For completeness, there are three other actuators, all the same p/n, for the two temp selectors (blend doors) and the recirc damper:
GM # 15844096
ACDelco # 15-73517