Weird groan leaving a stop.

[BR3W CITY]

Originally Posted by izzy_Britton

when my defroster is ON the AC pump is pumping. something i never understood

A/c turns on with defrost because of cars that exist in northern climates. Manufacturers didn't use to do that, but too many A/c pumps would seize the clutches from lack of use. They decided the easiest way was to add a clutch trigger from the defrost switch as well so it would run in winter as well.