i am haveing a issue with my 2001 monte carlo ss i cannot switch from floor vents to dash vents to defrost vents i figure it is a sensor or motor but all i have is all five vents blow at the same time and the switch seems to be working properly as when i switch ir around and hit defrost it automaticaly switches from recirulate to freash air intake like it is supposed to but will not switch to any one vent just all 5 vents blow and even at high fan it is low blowing due to all of them sending out air . i have found a blend door motor only and mine is fine it regulates how much heat and cold is mixed and on which side but i cannot find a door actuator for my car do you think this is the problem if so where can i find one at a good price or is there any other things that could cause this problem i did check every fuse in all the panels . any help would be greatly appreciated thanks .....ken