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2018 ram 2500 6.4 cooling issues.

BaseBD said:
@ClayG34 I had the same thought as you about the cooling system the 1st time I pulled heavy (~21k lbs truck and trailer). The oil temp kept rising and what I deduced pulling a few long grades with the truck is this:

Because the Hemi is warm blooded it doesn’t turn on the fan on hardly at all until your oil temp hits 250. ( I think must run an aux fan or at a really slow speed up until 250, which you won’t hit unless you are pulling a pretty steep long grade.) Once the oil temp hits 250, the big boy fan (crazy loud) turns on and the temps quickly drop down to the 215 range and will stay there through the rest of your pull. I first experienced this pulling HWY 14 heading west up into the big horns. This calmed my nerves about the cooling system being able to keep up.

Not a huge fan it gets to 250 before kicking in but with how loud it is, I can see that Ram doesn’t want it turning on too frequently, most people would think there is something wrong with the truck because of the noise level.
Click to expand...
Is it an electric fan on the truck?
 
Not sure, Honestly haven’t done any research to figure out up to this point.
 
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H3LZSN1P3R said:
Is it an electric fan on the truck?
Click to expand...
Yes that was my experience. And im like you those temps are crazy to me. I've run equipment my whole life and 185 to 200 is fairly normal so I have had a hard time getting used to this. My main concern is the hoses and the components getting hot. I recently replaced my upper hose because it was done. I couldn't trust my fans so I went with the aftermarket controller and I feel a thousand times better because I can flip a switch and be sure it is functional.
 
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