It is probably the blend actuator as when it does occasionally happen the air comes out in the correct place defrost upper vents floor depending on the setting just not the correct temperature seems to only happen to me in warm weather and the a c continues to blow cold on the passenger side but blows warm on driver side.
2009 chevy silverado drivers side blend door actuator.
My a c was stuck on just hot but this.
Took the actuator apart and checked motor with.
Took out blend door actuator that controls driver side heat air.
I am trying to figure if it is the actautor or the control.
Sorry to pop in here just to clarify this is the driver side temperature actuator and the easiest out of 4 actuators.
I told the customer that i would not be able to get to it continue reading 2009 chevrolet silverado driver s side air stuck on heat.
2003 gmc sierra blowing hot air on driver side.
Its pretty easy to get to.
After i replaced my actuator it messed up again like a month later.
This 2009 chevrolet silverado came in with the complaint that the a c was blowing out hot air on the driver s side of the dash the vent temperature was 140 f and the outside air temperature was 97 f in august in sunny south carolina.
I ended up taking it off and throwing some vice grips on the door itself and made it manual operation.
The driver side actuator is under the big black cover under the dash in the foot well area.