i have a 2011 Cruze and up until a week ago my heater worked just fine. my car now does this adorable little thing where it don't heat up while idling or at a complete stop. when i'm driving it blows warm air, but when i come to a complete stop it automatically starts to blow cold air. i've never had this happen before and i live in Wisconsin so a working heater is really nice this time of year lol. any help, suggestions, insight would be greatly appreciated!