When i turn the button on for the heater or the air it just won't click to get either. I do not have anything up by the windshield where when you put on the defrosters on i have nothing. So please let me know what the problem is. I have to have this for when winter gets here. Thank you, Also all the heat and air comes out of the air-heater vents. It's a heater switch i think i'm talking about. How often do these go bad on this type of car? and what can i do?