Hi everyone. I'm new to the forum and have a few questions about my Terrastar. Great Truck but I have noticed the temp gauge keeps going from 180 to 220. Had a forced regeneration done today but did not help. If I'm going uphill with a load warning light comes on everytime. It is the triangle light. If I'm pulling a trailer i can hear cooling fan come on every 5 minutes or so. Any help would be greatly appreciated. Thanks in Advance. Forgot to mention once I slow down to 60 or so truck will stay at 190 degrees. Faster i go the hotter it gets.