Overheating issues

2005 DODGE RAM
150,000 MILES • 5.9L • 6 CYL • TURBO • 4WD • AUTOMATIC
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DERWIN LANGLEY
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I am having an issue towing, if I run over sixty miles an hour my gauge will show I am at 245 but I slow down to 60 it will cool back to normal just that quick?
I just have a new engine installed in January, but I was having the same issue before as well new clutch fan, water pump and thermostat as well. What else can cause this?
Jun 26, 2018 at 8:18 AM
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ASEMASTER6371
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Good morning.

A radiator that cannot cool the system under load may be the issue. It may be too small. I would suggest getting a radiator that has at least one more core to add cooling ability.

I would go to a radiator shop and have them build you a radiator to fit your needs. Very common issue for towing with insufficient flow in the radiator.

Roy
Jun 26, 2018 at 8:30 AM
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PATENTED_REPAIR_PRO
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I had a similar problem on a Ford 6.0 diesel, it would run fine on flat ground with no towing, but towing up one side of a mountain, I never made it to the top without overheating.
Come to find out the cylinder heads were raising up while under load and/or it was a EGR cooler.
Being this is a Dodge, I have to ask you did you leave any of the original parts from the old engine, such as but not limited to the degas bottle cap (if equipped), any oil coolers that may have been added on or for that matter any OEM sitting in front of the radiator and transmission cooler? If there is cooler, make sure no leaves are blocking the air flow and that goes for the radiator as well, make sure also there are not a lot of bent fins on any of the coolers, radiator etc and if you find any straighten them back out.
Replace the degas cap and also make sure the fan does run when towing or when the engine is jut warmed up.
Jun 26, 2018 at 8:34 AM
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DERWIN LANGLEY
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The engine was a changed out at the dealership there for not for sure what was used from the old motor.
I will have to do some research on the degas cap.
Jun 26, 2018 at 9:10 AM
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DERWIN LANGLEY
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Was going to look at getting a new radiator. Was guessing it has a two core do not know if I will have room for a three core or not.
Jun 26, 2018 at 9:12 AM
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ASEMASTER6371
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Yes, it will. Three row will fit.

Roy
Jun 26, 2018 at 9:22 AM
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PATENTED_REPAIR_PRO
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I am seeing they have two rows.
I see it does not have a degas cap, there is a radiator cap.
What about the fan clutch see if it is bad. If it is just a plain thermostatic fan clutch once the engine is warm and thermostat open, shut the engine off and then count how many times the cooling fan spins. It should only spin three to five times before it stops. If it just free-wheels, replace the fan clutch.
Jun 26, 2018 at 2:17 PM