When you have heat controls on and blowing it does not keep a constant warm temperature .

ID Status Date Year Make Model Transmission Type A/C Controls Public/Private
#13152 Closed 2004 chevrolet silverado public

Does not keep a constant warm temperature goes from warm to cool and can hear a clicking on passenger side when you slide heat control up and down.

Sparky

Sounds like there is a broken gear inside the actuator or the door shaft may be broken. It will require physical inspection to determine which one.

2004 Chevrolet Tahoe Blows Hot Air

You might want to also check the engine coolant level.

2005 Chevrolet Tahoe, No or Erratic Heat

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