hello everyone i have a 2011 volt with no heat it is out of warrenty so it will not go to the dealer again. I have put a new heater control valve, new heater core filter that got me heat from gas engine.I checked electric coolant pump it's was good. Had dealer reprogram computer. only thing that i can think of is electric coolant heating element. But would like to test it some how before just buying new. Any help would be great sense i live in Minnesota and it is cold. thanks