I had the same problem. There is a filter down under the passenger side of the dash that clogs up and stops the air from blowing out any of the vents. I removed the filter completely and now it blows like new.
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had this problem which took a couple different directions. First was very simple...the control knob was turning on the shaft,, it had rounded off. Put some glue on it and worked for a year until problem like you described arose again. Replaced all components like you did but had intermittent blowing. Replaced blower again which solved problem...for now anyway...defective NEW blower.
if you do not hear the blower motor blowing it is possible. If it moves air but isn't cold the it would be in the compressor but if it doesn't move air at all id be inclined to say that yes it is the blower motor.
The switch or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Sierra running 100% again soon.
Blower motor resistor is most common ($20-$70) it controls the blower motor fan and speeds or fan relay fuse (usually under the hood) If it's not either then the blower itself is bad. You can pull the motor and apply 12volts to it to test, if it spins then the resistor.
sounds like the relay is turning on sending the power out to the blower motor resistor witch is locate dby the blower motor it is held in the case by two screws check it for power when you turn the switch on and off