Quick question... The air control setting is only working on feet/hand setting, nothing else.. I've watch the youtube video about the cable (line) being bet that controls the vent setting.. My 00 cavalier does not have that cable.. Should say I cant found it on the driver side.. Anyone having this issue or know how to fix?

 

You probably have a bad mode door actuator. Not familiar with the cavalier, but I believe it is run by vacuum. Look for it under the dash.