Auto fan speed?
 

I purchased a 2017 XTS. The automatic fan speed does not reduce when using On Star or making a phone call. It slows down when the high speed fan is trying to cool the car but the fan will not slow down when the high speed fan is trying to heat the car.
My Cadillac dealer service department has not been able to get an answer from General Motors, they tried all software updates to no avail. Does anyone have a comment on this or had they experience this?