"Alert: Engine Oil Hot, Action Required: Idle Engine"

calgator73 · September 22, 2014

Found this... http://www.g8board.com/forums/archive/index.php/t-25531.html

Jon A · September 22, 2014

Does the base radiator have a provision for oil cooling?

Yes, oil on one side, transmission fluid on the other (with the transmission fluid also going through an external air/oil cooler). It looks like the only difference is the NHT's core is about an inch taller and 1/4" thicker and it has larger inlet and outlet.

The NHT radiator is part # 23126402 and the standard radiator is part # 23126397.

Thanks for the part numbers. It looks like the standard radiator is discontinued? I wonder if that means they're just using the NHT in all of them now? It would be nice if it was a straight swap.

I'm not sure how much of a need there is though. It looks like we made it through the summer with lots of people towing with these things and other than this thread I don't think I've heard of anybody having temp related issues.

nando87 · October 2, 2014

I would love to switch my radiator out for the bigger NHT one.

Just two weeks ago I went to California towing about ONLY 1000lb, from AZ, and there is one decent size hill to climb. The temp outside was about 105 deg, about halfway up the hill sure enough my temp gauge started to move, it moved only an 1/8th but still I didn't think it would actually move barely towing 1000lb.

nando87 · October 3, 2014

I'm sure during their latest testing they noticed that the standard radiator couldn't handle the heat, having heating problems like mine, and that is why they now only offer the NHT radiator as standard.

calgator73 · October 3, 2014

It might have actually....j2807 speed, and frontal area are pretty lax. I think my tt is more than 60 sq ft (most are) and averaging 40 isn't with your foot to the floor....it's maintaining a speed off your choosing up front then allowing it to bleed off to prevent overheat while meeting standards.

Jon A · October 4, 2014

Just two weeks ago I went to California towing about ONLY 1000lb, from AZ, and there is one decent size hill to climb. The temp outside was about 105 deg, about halfway up the hill sure enough my temp gauge started to move, it moved only an 1/8th but still I didn't think it would actually move barely towing 1000lb.

While the bigger radiator will help in many situations, the above is mainly indicative of the fan settings. With the fans running hard, the stock radiator should have no problem handling that situation.

The big advantage of the larger radiator will come in situations where the fans are blasting away with the smaller radiator and the temp is still climbing.

That said, you could be right. While I haven't had any temp issues at all with better fan settings, I haven't exactly done a Davis Dam equivalent test. It could be they found they needed more radiator in test and added the bigger one to the NHT package after the fact, and for 2015 added them accross the board. It doesn't make economical sense to design a different radiator to only use for 1 year. It kind of sounds like the NHT was the "new and improved" version, the NHT trucks just got them first.

Looking at the part numbers it seems the radiator itself is the only part that changed for the NHT and all supporting parts (mount, supports, etc) are the same which would indicate it's a straight swap. Hopefully that's the case, I guess until one of us tries the swap we won't know for sure.

It might have actually....j2807 speed, and frontal area are pretty lax. I think my tt is more than 60 sq ft (most are) and averaging 40 isn't with your foot to the floor....it's maintaining a speed off your choosing up front then allowing it to bleed off to prevent overheat while meeting standards.

One clarification--in the Davis Dam test in J2807, while I agree 40 MPH isn't very fast, it's not an average speed, it's the minimum speed. It may not sound like much of a difference, but it is significant. They could run 60 MPH the entire way, but slow down to 39 MPH for even one second in the last mile and it fails the test. The last mile has a higher average grade than the rest and it's at a 3000 ft higher altitude, I would expect lots of trucks to slow below 40 right at that point when pulling the limit. While not Davis Dam, here's a test where a similar thing happens:

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That's a 2015 2500 HD with the 6.0 gas. I think it holds well over 40 until the very end...it slows all the way to about 25 MPH and has to downshift into First Gear! IMHO, that's just not enough engine for that much weight and would fail the test if it did the same thing up the Davis Dam. If it had been 100+ degrees, who knows where the temps would have been. They need to put the 6.2 into the 2500's....