One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored in the HVAC control module should be available to assist with diagnoses.
Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on Chevrolet Silverado SS
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Sometimes if your jumping through the settings it won't do what you want. I tried turning the cold air to warm air and it wouldn't come out warm. Turned the truck off and back on then turned the warm on and it worked.