I don't have this problem all the time. But here's the story of whats happening. First off running around town and highway driving my temp runs about half most of the time. Once in a while it will move up about a needle or two over half. Now last October I went to Vegas from central California. Anyone who has made this drive know about the Baker, CA pass. Those who don't, well its a strong incline for about 20 miles. It has been known to cause overheating problems for many of cars and trucks. Well about half way through my truck start getting hot. I had to slow down and turn the heater on to keep it cool. Its not as bad of an incline on the back from Vegas but I had the same problem. I did have a bed full of equipment both ways. If I had to guess I would say that it weight about 400 lbs at most. It did not even change the ride height, it weighted so little. In February I made a 600 mile trip to northern California and I had absolutely no problems. So my question is; is it normal to reach such high temps with steep mountain grades in these trucks or could something be wrong. The sad part of this trip to Vegas was that I would being passed by Ford and Chevy trucks like I was standing still. Thanks for all help in advance.