skippy7024

I replaced the thermostat and now it seems to stay just under 210 all the time. Thanks for all the help. I hope this helps somebody else.

I got radiator back from radiator shop. They found nothing wrong with this radiator. I asked about a new one with more cores, and they told me this radiator is more than enough to keep this truck cool. They think the problem is somewhere else. They don't think a bigger core radiator will fix the problem. Theyt also said that the size of the radiator and the way it is designed that I don't need and external transmission cooler or oil cooler. I guess I can remove the waterpump and look at the fins. Does anyone know of a check ho to see if the waterpump is producing enough flow?

I agree with you. I would think that it should stay around 185.

I am going to take the radiator to a local shop to have checked out. I know I can get a bigger radiator, but this radiator is the same that they use in 1 ton duallies. I would think that if my 1/2 ton pick up could pull this camper without getting hot, a 3/4 ton truck desigened to tow should be able to tow without overheating. Am I crazy for assuming this.

It has 130,00 miles. What would be the best way to tell if it has flow. If I let it run without the cap, could I see fluid moving in the reservoir.

Thanks for the advice. I had already cleaned the radiator and condensor. I also had the radiator flushed. I went ahead and put a new clutch fan on it. I took it out today and had the same problem, but I think it is a little better than before. Gets up to 230 going up any type of grade on the highway, but then cools down to 210 - 215. I have never used this truck to tow my camper with. This is a 2500 HD 6.0. It has Tranny cooler, oil cooler and power steering cooler. I assumed it was made for towing. I used a Chevy Silverado 1500 5.3 ltr. to pull this camper before. It never got over 210. I took it to Virginia through the Mountains. I don't care to purchase a new radiator, but I can't believe a truck 6 years old has a bad radiator.

I have a 2003 2500HD 6.0 auto trans 2wd. Normal driving the temp stays around 210. I have a 27 ft travel trailer. When towing this the temp climbs up to 230 240. as soon as I pull over, it will cool off fairly quick. I tried to flush the radiator out, it seemed to help a little, but still gets hot. I would go buy a new radiator if I knew it was the problem.