GMC Sierra Defroster

I Have A 2011 Gmc Sierra. My Question Concerns The Defrost. On Other Vehicles I Have Owned When Using Defrost The Ac Engaged To Assist...

Hoping To Find Actuator To Replace In Hope's To Repair, But No Idea Where It's Located Or How To Find It.

My A/c Only Blows Through Defrost Vents. Upon Initial Startup Itll Blow From Regular Vents But After About A Minute Or Two Itll Only Blow...

What Does It Mean If The Heat Comes Out Of Vent But My Defrost Doesn't Work

Air Only Blows Through Defrost Vent. A/c Works Fine.

I Have A 2003 Gmc Sierra 5.3l V8 1500 4x4 It Only Blows Air On The Defroster, Not On The Front Vents Or The Floor? I Have Already Replaced...

Turn Off Heater But Still Puts Out Hot Air. Change To Defrost, Feet/face, Etc. Doesn't Make Any Difference

So, No Matter What Switch I Turn It To, It Never Blows Through Anything But The Defrost Vent. Blend Door Motor. Mode Actuator ? I Don't Know...

The Fan For Air Doesn't Work Until The Dial Is On Max No 5, Also Noticed That When Its Turned On The Defrost Or Air Condition Mode The Ac Is...

My Pickup Vents Wont Change The Ac And Heater Come Out The Defroster Vents None From The Front Vents