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Heating & Cooling 3rd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 05-29-2014, 02:45 PM
benoit benoit is offline
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Default 2004 4.7 overheat?

Hello all, I'm from Québec, Canada. I have a 2004 Quad cab 4.7 4WD with 65000 miles. The coolant temperature gauge jump to the right when I ask for power. For exemple if I stay at 55 mph or in the traffic the gauge needle stay just above 1/2, even in summer. If I drive at 80 mph, go uphill or tow a trailer the indicated temp goes up. The fan works (I can ear it), I have flushed the coolant and didn't notice dirt, changed the thermostat, radiator cap and clean the radiator externally.
What can I try now?
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Old 05-29-2014, 08:59 PM
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RogerRamJet RogerRamJet is offline
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Have you changed the water pump? It may not be providing enough flow when you ask for more heat from the engine.
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Old 06-02-2014, 05:06 PM
benoit benoit is offline
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No I have not changed the water pump. Is it possible that the impeller slide on his axle?
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Old 06-02-2014, 05:09 PM
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I don't think it slid on it's axle, but more likely that the impeller has been eaten away from electrolysis and doesn't pump as much water as it used to.
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Old 06-09-2014, 03:49 PM
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Default Cooling issues

I agree with another poster that the water pump is a good place to start. Have you noticed in the winter that the heat doesn't get very warm at idle? When the impeller erodes, it does not push as much coolant and that is a typical symptom. Also make sure all of the air is out of the system.

Fairly low miles but considering age of the vehicle and symptoms could also be the radiator. Trust me, a simple flush won't rule out a clogged radiator. does the radiator feel warm across the entire surface or are there "cold spots" ? I would start with the water pump but don't rule out the radiator. I actually replaced my radiator when I did the water pump - I had to remove my fan clutch either way and drain the system - radiators are fairly inexpensive and easy to replace especially if you are already opening the system (I found good quality Spectra radiators online for around $125 or so..) Also, considering the vehicle age, replace the upper and lower rad hoses when you do the job - in some cases, the lower rad hose will collapse from the pressure under higher demand and obstruct flow... It's not just vehicle miles, but also age. Make sure the fan shroud is properly attached and no cracks.
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Old 06-10-2014, 07:50 PM
dedhowy dedhowy is offline
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Default

Make sure to check the radiator. My '02 Ram was overheating and ended up having alot of the casting sand used by the factory for the block clogging up the radiator and thermostat. You can check this by pulling the thermostat housing off and looking for buildup in the hose and on the thermostat. If this is the case you'll have to have a power flush done and a new radiator and thermostat. Hopefully the water pump is still good and isn't damaged. Hope this helps and good luck!
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