Hey everybody hope everybody's having a blessed day can anyone tell me what the little motor in the headliner above the driver side is because it is constantly running even when car is off wondering what fuse controls it

 

ambient temp sensor for the climate control.

 

GM Genuine Parts 22834330 Cabin Air Temperature Sensor Aspirator

GM Genuine Parts 22834330 Cabin Air Temperature Sensor Aspirator

 

Alyssa203 are you 100% certain "it is constantly running even when car is off" as you described?

Asking because there is no fuse, instead it's driven directly from the Climate Control Module in the console (HVAC) If you turn the A/C off (Lower LH button) or open a door with the ignition key removed, the little fan should stop. If not it could be a faulty Climate Control Module (HVAC - expensive)

There is a YT video about the Aspirator, you can see the wiring details starting at 2:19

You Tube

The Aspirator P/N is GM 22834330, it's cheap and can sometimes just be repaired.

Hope these comments help you and if so please let us know.
[Awaiting Resolution]