The switch that selects between the defroster, floor, and dash vents is acting funny. No matter what position I put it on, I can not get the air to come through my dash vents. It does switch between the floor vents and defroster, just not the dash vents. Either it comes through the defroster or comes through the floor vents.

Any suggestions as to what might be wrong. Could it be the switch itself as gone bad, or possibly something major like my AC is going out. The air blows very cold though the defroster and floor vents.

Help needed....How can I find out what is wrong???

 

Often caused by a vacuum leak in the control system. Diagnostic help.