Chevrolet: ventillation directional controls, blown fuses, vacuum line

Question
2003 Cavalier - Heater / AC blower works fine but can not control air flow direction.Could it be Vacuum line?  If so, easy way to check?

Thanks for the service.

Answer
Hi Larry, yes it is probably a vacuum line, the easiest way it to pull out the controls, but first go to the dealer and ask them to give you a photocopy of the hose routing and color code, then with the engine check to see if there is vacuum to the heater controls. also check for missing or blown fuses. I hope this helps you if you need more info just let me know. Regards, Keith.