What can I do to cool down my truck. I bought a 95 GMC 3500 dually 4x4 for towing my blazer to the trail. It has a custom air intake to the turbo that does not go to a box and 4 inch strait piped exhaust. I also has a manual boost controler that was already installed when I got it, but it does not seem to change anything when I adjust it. When I am empty or towing on level terrain, my engine temp is about 210 and my egt's are about 600. But when I go up a steep grade with a light load the egt's hit about 950-100 and the engine temp goes up slightly. If I have a heavy load,(my blazer and a load of wood for the weekend) the engine temp will hit about 250 and the egt's will hit 1100. The only thing I have been able to do to stop this so far is to slow down to about 30mph or just stop until evrything cools down. What can I do to lower these temps? I really am not worried about going fast, just getting there without overheating.