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 3500
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If u switch from a/c to heat or vis- versa the heat or a/c stay on when you want the other if i shut off motor an cool it for several minutes upon restart the heat- a/c you wanted starts.