Please advise on the 99 C230 Kompressor AT, what noises are associated with the kompressor besides start up? Is kompressor all time on, I believe it shuts down around 600rpm somewhere and turns on at 1200~. Does Kompressor kick in at around 80 miles per hour and up?? When it shuts down, do you hear any noise? Also when u do kick down at hignend speed, does it downshift to first or second gear?Thanks!