Does anyone know the part number of the interior ambient temperature sensor (senor above drivers head) for a 2001 Blazer with automatic climate control?

I've rerplaced all the sensors in the grill area but still have issues getting the "climate control" to properly add heat to the car in cold weather.

I've also eliminated any damper issues.

Thanks

 

Hi, I just replaced the part for same issues. Part no. is AC Delco 15-51149. GM no is 15756446. I'm a shop and paid $68. for mine. Wasn't the issue so have a new one here. I'd sell for 55 if you want it. Thanks.