I own a 2008 Ford Edge SE, lately it seems the air has been very temperamental. When I start the car the air may or may not kick on. When it doesn't I try to flip through all the settings but usually to no avail. Though sometimes I may leave the air "on" and while driving for awhile it kicks on, but this is not every time. When I do go through the different settings, floor, defroster, etc, I can hear clicking as if the signal is going through. Some other things I notice, if the heat/AC is on it runs finds, though if I turn it off it might not kick back on. Any help is much appreciated.