It has been at least 2 weeks in -20 weather and no heat in the vehicle, have to run the fan so the windows stay clear. When the radiator flush was done I stayed in the car and got chilled. Had 2 quilts on that night and finally warmed up some in bed. I had a fan belt problem and because the heat was not that good I got the thermostat changed at the same time 2 weeks ago. Some people are suggesting that it could be the temperature gauge is running on air condition all the time and needs to be changed. A second suggestion is the water pump. I know some about cars, and see where these suggestion could be it, BUT I don't want to spend any more money than is necessary on it..Please I am freezing in my car and I need it for work.