2013 Challenger Vent Problem: I am having yet another issue with a "knocking sound" that started in my dashboard. Now, two months later this darn knocking sound is occurring on the passenger side. I was told it is the actuator AGAIN. The sound is noticeable once the car sits for a while & when you open either door there's the annoying sound. My research is it is a vent actuator blend issue. Any advice to correct this problem? I have already paid $307.05 the first time for a $35 part. Uggggh, so frustrating that Dodge will not acknowledge this issue!!!