My Cruze is really having a hard time when I want to change controls. Most of the time I have it on defrost and floor. The vent control grunts and you can hear the vent trying to move in the dash. So I try floor and again same noise. No matter where I put the setting it struglles to move there. The vent change will get there but its a long time. On really cold days it gets stuck in-between vents sometimes. Sounds like it needs greasing because of the noise it makes but how do I get in there to fix that?