Question about 2002 Dodge Ram Maxi

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2002 Dodge Ram 1500 with a 3.9 engine overheating

I've had a water pump, thermostat, and clutch fan replaced in this truck and it still is overheating, but only when i'm on the highway (fast speeds) when im in the city it does not overheat

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  • newosknu51 Oct 17, 2008

    Same type of problem except it is after 6-10 miles and I have also had the hoses replaced and no signs of a blown head gasket, water in the oil or hydrocarbons when tested. This is on a Ram 1500 quad 318.

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  • Dodge Master
  • 6,674 Answers

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.

Posted on Aug 30, 2008

  • dave Oct 18, 2011

    check the timing

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My 97, 5.2 runs 200 without AC, if I turn on AC, it goes to 220. Replaced clutch fan, thermostat, water pump, and new cap. Backflushed block and radiator. No results. Why so hot? Only 92K on unit.


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

Oct 03, 2013 | 1997 Dodge Ram 1500 Club Cab

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RAM 1500 4.7 Now over heats up hills.I replaced the water pump because it was leaking from the weap hole,then it was over heating up hills i replaced the thermostat it still over heats up hills.How do I...


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.

Aug 28, 2010 | 2005 Dodge Ram 1500

1 Answer

Engine runs hot sometimes changed water pump,thermosate, sencor,i have checked with temperature gun 230. 2002 dodge ram 1500 5.9


Did you check your fan clutch? If it runs hot running around town, but cools going down the road this could be it. also check radiator for obstructions like bugs or bent fins.

May 02, 2010 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

2002 dodge ram overheating


did you replace the #1 cause of overheating?the thermostat?

Oct 12, 2009 | 1999 Dodge Ram

2 Answers

My dodge ram 1500 is overheating and burning the coolant. I already changed my radiator and the thermostat, and it's not leaking but I can smell like burnt coolant, I have to be putting more cooling every...


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.

Sep 05, 2009 | 2004 Dodge Ram 1500

2 Answers

2002 dodge 1500 still overheating


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.

Jul 24, 2009 | 1999 Dodge Ram

1 Answer

1996 dodge ram 1500 overheating


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.


If you find my suggestions to be helpful, please share with us some details so that others may benefit from knowing the whole story. Thank you!

Jul 12, 2008 | 1996 Dodge Ram

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