When my dad first acquired what is now my soobie, he had a tune up done on it, and a block heater put in. its REALLY nice to be able to start it so easily in sub zero idaho temps. But when I went to start it this afternoon (outside temp was about 8 degrees fahrenheit) I had the ROUGHEST cold start I have EVER experienced with this car! the temp gauge confirmed that although I had it plugged in, the car did not heat up the way it normally does when I have it plugged in all night. Something went haywire, and im lost as to what it could be. I plugged it in again today when the engine was cold, and normally you can hear a very audible "hiiisssssssss" when the block heater is working but I heard nothing. Any ideas??