I push a 7.5' Meyers plow residentially and commercially with my Comanche. Recently I replaced the water pump, thermostat, and radiator and tagged in a temp gauge. Here in PA it's been cold and truck will not run above 140 on a 30 degree day even with the plow up blocking the grille. Lately it's been in the single digits and struggles to run 110 and the heat at best is like warm. I have a 2.5 in it. How much of difference has anyone seen blocking off the entire grille? I have a 195* t-stat in it.