CHEVROLET SILVERADO DEFROSTER

I Have A 2003 Chevy Silverado 5.3liter It Has 80,000 Miles. My Question Is When I Turn On The Air It Always Blows Out The Defrost. Will Not...

When I Switch To Have Air At The Dash Vent, Nothing Comes Out. It Seems To Be Stuck On Defrost And Feet. The Fan Is Working Just Fine Along...

There Had Been A Clicking Noise Coming From The Dash, I Believe Lower Passenger Side. Today I Have Heat Coming Out Of The Vents, But When...