My 96's blower controls seem to to be working properly. Ever since I put the truck on defrost/defog about a month ago the blower control wont switch back to face. When it is on the face setting it blows out of the defoger vent. The feet vents are working fine tho no matter which setting. I really need this fixed because me and my family are using my Tahoe to move furniture up to our other house in VT and going down the highway with out working a/c and fan will be torture. All other setting work on the climate controls except the directional control which won't change to face.