Nothing blowing out vents when turned on. Happens randomly often. I can’t get the issue fixed because by the time I make it to Chevrolet the problem has fixed itself.
On all fan speed settings? Even on maximum?
Turn the ignition switch on.
Set the fan speed to high.
Reach under the passenger side of the dash, and with the handle of a screwdriver rap on the blower motor.
If blower starts working, replace the blower motor,
Tester