Was out last nite and temp lite started flashing when there was no reason it should have the snow was loose and not packed. I started driving on the side of the trail in the powder and the lite stayed on now. I got in a field with 8"of powder drove around and the lite would not go off. I stopped felt the heat exchanger and it was cool put my hands on the cylinders and they were warm coolant tank was full and warm. I could have taken the spark plugs out with my fingers they werent even hot. I drove about another 10 miles to a restaurant and it ran fine lite never went out. In there about an hour came out started machine temp lite on. Drove about 15 miles machine ran perfect then temp lite went out and never came back on. Any ideas? Thanks.