I have a D5H dozer that will run at about 170 degrees for the first 30 min to 1 hour and then it will heat up to 200. I have been told 200 is ok and told that it is not. So that is the first question is this a safe operating temp? I have used an infrared scanner and found that the transmission cooler gets to 200 first and then that is causing the engine to run at 200. Any recomendations?