The blower motor assy is right behind/below the glove compartment. Easily accessible and last time I replaced mine was about $40 from Rock Auto. Shouldnt take more than 30 minutes total time.
You can easily disconnect it to make sure thats where the noise is coming from.
2005 5 cyl, Black on Black, 4 door
2016 Z71, Black, Long Box, 4 door
the only time in makes a noise is when the fan is turned on. I found where the blower was and that's how I pin pointed the noise. but I really didn't take the time to see if all the screws were easily removed. thanks