What is the normal temps for engine coolant? I had my stack cleaned last year and temps were running about 180 during fall and winter after cleaning. Was having issues overheating pulling 13k 5r up hills. 240 degrees. Yes I kept the rpms in the 2k- 2.5k range. It now running 210 empty 90% of the time but once in a while it will lower back to 180. A slight grade will bring temp back to 210 running empty. I do have Robs tune which I run in the enhanced stock mode when empty and the 40hp heavy tow mode when pulling 5r. Shes got 150k on her. I did put oversized stock tires on ( lt265/75R16) instead of the stock 245s which i think I regret because it raised the gear ratio and find myself using 3-5th gears to control temps. Radiator hoses, cap all new and on second flush.