Over heating issue

How was it before you installed the new radiator? Is this a new problem or an ongoing condition that the new radiator did not correct?

it worked fine it is the exact same radiator that came out of it. the one thing i havent done is replace the cap could it be that minor of an issue?

Air trapped in your cooling system perhaps?

i thought about that but i just got done running it 600 miles you would have thought the air would have disapated in the system running it that long

Did you change the thermostat?

not yet i thought i would get some ideas before i started throwing money at it. i thought it could be the water pump but being it is cooling off quickly i dont think that is it. just kinda stumped

iamalienru wrote:
it worked fine it is the exact same radiator that came out of it. the one thing i havent done is replace the cap could it be that minor of an issue?

Yes, a cap is critical.

The radiator cap comes in different pressures. If it is sealing properly, the increased pressure will raise the boiling point of the coolant. For every pound of pressure with a radiator cap, the boiling point goes up 3 degrees. In other words, a 15 pound radiator cap will increase the boiling point 45 degrees.
A weak cap can allow coolant to blow out of the radiator when it reaches operating temperature and will not allow coolant from the overflow tank to be sucked back in. A weak cap also lowers the boiling point closer to 212 degrees which might explain the coolant boiling over sooner and explain why you have to add coolant before each trip. That is a cheap item to attempt to solve the problem.

Do you have a hydraulic powered fan? Does it speed up when hot? Have you tried downshifting when it gets hot on the hills?
Bill

Try a new cap. Does the engine have bleed lines to remove the air? I'd suspect the thermostat or the fan isn't turning fast enough. Maybe the fan thermostat or wiring? Probably a remote possibility that something happened to a vane on the water pump.