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2004 dodge ram is over heating, the thermostat and fan clutch have been replaced.Doesn't(over heat) in cool weather,but will in mod. weather if driven over 70mph or hilly terrain due or increase of rpm,and definitely will in hot summer temp. of 90 F.Water is circulating in radiator and fld levels(H20&coolant) are correct without any leaks.Could water pump be faulty at higher rpm?Has dodge had any of these problems on this year?

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Water pumps can stall out, but do you have air trapped in system.
Had you recently had the system "open" to replace hose, thermostat, temp sensor. Some Ford and GM have a bleeder screw on a high point in cooling system to bleed out trapped air.

Check your trans fluid color. Since the trans cooler is built into radiator (automatics)

IF the engine is overheating the trans CAN overheat
IF the trans is overheating the engine CAN overheat

They share the same cooling source and trans fluid gets hotter than oil, but yet it has a wimpy cooler built into radiator. Maybe add trans oil cooler to system.

Also outside temp affects the cool down rate of the radiator, ie...hot air trying to cool down hot radiator/engine is less effecting than cool air cooling hot radiator/engine

Posted on Aug 06, 2008

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I see your post was a while ago. I hope this helps you or anyone ells having Dodge over heating issues.

I have a 2002 Dodge Ram 1500 and a 2005 Dodge Grand Caravan. I also owned a 2001 Dodge Grand Caravan. ALL of them had thermostat issues. When you replace the thermostat make certain you get the proper heat rating. If it is rated tool low, then the check engine light will trigger the code that the engine is not heating up fast enough. I also recommend going with a 'fail-safe' thermostat. These thermostats fail OPEN rather than closed. My 2002 RAM factory thermostat failed closed, built up pressure, then blew half the water out from under the radiator cap. This happened in less than 35k miles. The dealer replaced it. After a couple of years it failed again. Make sure you have 50/50 mix of anti freeze to water. This raises the boiling point of the water, makes it more efficient for cooling the engine, treats the water so it does not corrode and scale up the cooling system and helps keep the liquid from boiling off there by reducing the volume of fluid in the cooling system. Also, BOTH my 02 RAM and 05 caravan developed a leak in their radiators. They were slow leaks and I did not notice it until I did some standard checks and found the coolant was low, Most shops can run a pressure test for less than $40 to let you know if your radiator is leaking.

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Hello
If we have a good thermostat. then check into the clutch fan , it sounds like your fan is on all the time
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