is it normal in the cummins to have very little heat, its now cold here and its the first year for me and the cummins and it does not put very much heat off, sitting still it will kinda warm up but as soo as you start moving the heat goes away. the idiot gage show the motor is warm but not much out of the blower. do you need to cover the radiator up with something to get more heat in the cab?????