I know this probably makes me sound like an idiot, but I have to ask. I have a 93... I'm not sure what years this switch is on but it is just the the left of the middle air vents. It's doesn't make a difference when I slide it up or down... it sounds like it changes something but it never feels the same. There is a button for recycled or outside air so what ion the world is this thing for??? Please let me know! Thanks!