Hi! Not much of a mechanic, but hoping someone can help! I have a 2006 Impala. The dash heater/AC control just stopped working. Nothing works (AC, Heater, fan, rear defrost). No lights come on as they used to. I checked each and every fuse under the hood and on the passenger side compartment. All are fine. Any ideas what could have caused a complete loss of power to the unit? I didn't notice any other symptoms until one day nothing worked. Thanks for any ideas or advice!