Does anyone use grille covers during the winter? Even when my tractor is plugged in it takes a very long time before I get cab heat and the temp gauge never goes above 1/4 when it is below 0. My truck will do the same thing without a cover but it came with one from factory as well as a supplemental electric heater to warm the cab right away. I don't see anything in my maunual and the dealer wasn't sure either so I may go with some old fashioned cardboard. Anyone heard of actual grille covers for tractors?