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My 2002 Spectra's blower was only functioning on the Defroster setting.  About a week and a half ago the Defroster stopped working and now only the front vent is blowing.  No air blows from the floorboard and all blower speeds work properly.  It was a very cold morning when the function switched from Defroster to Vent and I didn't do anything to make it switch.  
Again, it doesn't matter what setting the selector switch is on.  Air only blows from the front Vent.
Any ideas? Please Help...