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


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  #1  
Old 11-26-2014, 06:10 PM
Mmiller741 Mmiller741 is offline
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Default Hot Under the Hood

Working on my dad's 2004 1500 4.7L SLT. A week ago he noticed the truck was overheating. The lower radiator hose was leaking and the system was very low on coolant. He replaced the hose and refilled, all seemed well. A few days later, the truck was started and immediately showed as running hot and through an engine code for the faulty sensor. We replaced the coolent temp sensor, but truck still overheating.

I replaced the thermostat and radiator cap, but still overheating. I noticed the top of the radiator was very hot, but the bottom was cold. I replaced the radiator, but still overheating. I noticed the upper radiator hose sounded like it was bubbling/gurgling.

This morning I installed a new water pump as they were running the original. Still having the same issues.

Can anyone point me where to look next?

Thanks so much.
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Old 11-26-2014, 06:55 PM
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You are burping the system right?

Sounds like you've got air in the lines and coolant isn't actually flowing.
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Old 11-26-2014, 07:06 PM
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Thanks Arth. I've let the engine run for quite some time with the cap off. Coolent levels fluctuated a little and had some spillage. Truck was definelty hot. Temp dial about 3/4 on the gauge. It drops to just above half with the heater on.
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Old 11-26-2014, 07:12 PM
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Did you squeeze the radiator hose with the cap off?

It does sound like you may have coolant flow. I wonder if you've got a blocked up or slightly clogged heater core?

You've replaced almost everything else in the cooling system that I am honestly almost out of ideas.

I don't know if there might be other damage because the engine overheated.
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Old 11-26-2014, 11:45 PM
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So went back out and let the truck run without the cap some more. A lot more bubbles came out. Sure didn't look like a noticeable "flow" in the radiator. I had my son rev the engine to 1500 RPM's and a substantial amount of fluid was forced out radiator.

I also turned the heater on and the fluid level dropped quite a bit too. Still running hot, but it did take longer to heat up though
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