Last week I was up in Munising and put about 250 miles on over 4 days with no problems. After the sled sat overnight I went for a ride and the temp guage needle kept climbing so I slowed down and took it easy back to the house. What could have caused this? The other four days of riding the needle would climb to a certain spot and would never move, even in extended runs on trails which were mainly ice. It never reached the red zone but it was getting closer than I was comfortable considering it was far below it before and never moved. What should I check?