We just bought a 2001 3500 one ton diesel truck. It heats up going up hills with the 5th wheel attached. When its hot you can touch the radiator and it is not over hot nor does it overflow. We had the radiator flushed and a new thermostat put in. same problem. Any sugestions

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Due to cavitation, it's extremely important to take proper care of a diesel engine's cooling system. Use only a 50/50 mixture of recommended antifreeze and distilled water. Be sure and add the necessary supplemental cooling additive (SCA), when changing coolant, and check/add additional SCA every 6 months. Change coolant every 2 to 3 years, depending on use. Check for possible blockage in the radiator, due to corrosion or mineral buildup. You may need to have the radiator rodded or replaced.

I've never used this product, but you might want to give it a try:

Super Cleaner (http://www.valvoline.com/pages/products/product_detail.asp?product=15)

We have a 2002 dodge ram 1500 4.7 liter over heats changed thermostat and water pump still over heats what next DO I check. It only over heats when I drive it. Sitting idle it doesn't

Due to cavitation, it's extremely important to take proper care of a diesel engine's cooling system. Use only a 50/50 mixture of recommended antifreeze and distilled water. Be sure and add the necessary supplemental cooling additive (SCA), when changing coolant, and check/add additional SCA every 6 months. Change coolant every 2 to 3 years, depending on use. Check for possible blockage in the radiator, due to corrosion or mineral buildup. You may need to have the radiator rodded or replaced.

I've never used this product, but you might want to give it a try:

Super Cleaner (http://www.valvoline.com/pages/products/product_detail.asp?product=15)

We had it flushed last month how do we check to see if it is radiator

Use an infrared (IR) thermometer on the radiator. Also, you can verify that the lower radiator hose is much cooler than the top radiator hose, when the engine is at normal operating temperature.

If it does as you say, " not over hot or overflow ", it might be the gauge or sending unit. Pulling a 5th wheel up hills is no easy task. I would try the same thing without the trailer -what happens?