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Re: 2002 Dodge Ram 1500 with a 3.9 engine overheating
Check your rad hoses. They will tend to collapse (**** in) & cut down on flow at highway speeds, more than city, due to increased demand & flow on cooling system. If they don't feel relatively stiff, I'd change them. You might even see them **** in while sitting and revving the engine a bit.
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dodges run like that. if your worried put a 180 degree thermostat in. maybe even a 160 . wont hurt engine or fuel mileage . my 99 dodge ram 1500 sport runs fine with 160 degree one. hope it helped , good luck
I think this uses a fluid filled thermally controlled clutch. When the engine is cold, (and OFF), you should be able to move the fan easily by hand. Once the engine has warmed up to normal temp, park it, shut off the engine, and again try to move the fan. It should be very firm compared to when cold. (Don't push too hard on it, you can bend the blades.)
A bad fan clutch usually shows up as overheating during idle and stop-and-go driving, however. At a steady speed of above about 35 MPH, you don't need the fan. So if you are going up the hills at more than 35 MPH, I'd suspect the radiator might be somewhat plugged. You can try having it pressure flushed (that might help) but if not, you might have to replace the radiator. Try to get a higher capacity (more cores) radiator.
I would defiantly check the water pump, can you feel pressure in the rad lines? when you changed the rad and thermostat out, did you run your vehicle without the rad cap for awhile to ensure that there was no air locks within the system? Water pump is located at the front of the engine behind the fan. Good Luck! hope this helps.
when your engine is hot,check the temperature of your rad,if you get more than 30/50 degrees difference between the top and the bottom of the rad,you need to have your rad professionaly flushed.If you have a digital laser it will out perform any other temperature testing tool.
Check the lower radiator hose to see if it has gone "soft" Check when the engine is cool and stopped, grasping the hose and giving it a squeeze, you should feel the presence of a "spring" in the hose. That should be there to prevent the hose from collapsing as the water pump draws coolant through it. Without the spring, the draw created by the pump intake, and the resulting venturi effect will collapse the hose, cutting off the flow.
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