Highway Overheating

JKDream · Jul 26, 2017

Lmoye22 said:
Once i installed the transmission cooler the hot oil light did go away under hard driving

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That was one of my issues as well. I originally had overheating from the mud, but it was actually the transmission overheating.
On my 2013 the transmission cooler is built into the radiator, so it wasn't cooling properly.
That's where your problem might lie, the transmission opposed to the engine.
Mine still gets hot some days, but never enough to ding the oil light on, and that's perfectly normal.
How long ago did you replace the transmission? If you've had the hot oil light since then, I'd replace the fluid.
It's typically burnt after that light comes on.

** You might want to make sure they put enough fluid in the transmission as well.
A lot of shops mess this up. Especially if it was a new transmission, they might have underfilled it.

Rocralr · Jul 27, 2017

Hello. I run the Mishimoto radiator in my 2015 JKU with a Supercharger. I have not had any problems!!

hyvltge · Oct 24, 2017

Rocralr said:
Hello. I run the Mishimoto radiator in my 2015 JKU with a Supercharger. I have not had any problems!!

What coolant do you use?

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Ddays · Oct 24, 2017

hyvltge said:
What coolant do you use?

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Like WJCO replied in the other thread, there really isn't any reason to run anything other than what the factory recommends. :idontknow:

danford.lau · Sep 3, 2019

Bumping an old thread .. fully loaded Jeep going up long mountain roads in NorCal runs super hot . 235 to 240 going uphill . Can keep it under 235 with AC off and heat on still maintaining 60. Outside temps are 100+ . Trans temperatures seem to be okay at less than 170. Thoughts on what will help and what magnitude ...

1) PS Bruiser bumper to lower the winch
2) aftermarket radiator
Others ?

Coolant was recently flushed and coolant level is good .

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HighwayTrout · Sep 3, 2019

danford.lau said:
Bumping an old thread .. fully loaded Jeep going up long mountain roads in NorCal runs super hot . 235 to 240 going uphill . Can keep it under 235 with AC off and heat on still maintaining 60. Outside temps are 100+ . Trans temperatures seem to be okay at less than 170. Thoughts on what will help and what magnitude ...

1) PS Bruiser bumper to lower the winch
2) aftermarket radiator
Others ?

Coolant was recently flushed and coolant level is good .

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What gears are you running?
Have you cleaned all the fine dusty silt and junk out of your radiator?

danford.lau · Sep 3, 2019

HighwayTrout said:
What gears are you running?
Have you cleaned all the fine dusty silt and junk out of your radiator?

4.88

No I tried spraying water behind but need to remove the fan shroud to really access .

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fiend · Sep 3, 2019

In my experience overheating on the JK is most likely due to air flow blockage. Such as mud caked in the radiator fins and/or winch, lights, etc in front of the radiator. I would start there.

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BaddestCross · Sep 3, 2019

danford.lau said:
Bumping an old thread .. fully loaded Jeep going up long mountain roads in NorCal runs super hot . 235 to 240 going uphill . Can keep it under 235 with AC off and heat on still maintaining 60. Outside temps are 100+ . Trans temperatures seem to be okay at less than 170. Thoughts on what will help and what magnitude ...

1) PS Bruiser bumper to lower the winch
2) aftermarket radiator
Others ?

Coolant was recently flushed and coolant level is good .

Sent from my iPhone using WAYALIFE mobile app

Sounds about normal to me. Did you replace your thermostat and get your radiator pressure tested though?

I just got back from another run up to the Sierras and the climb from the desert up the grade to the meadows get the temp gauge up to between the 3/4 and 1/2 marks with the Jeep loaded down running in 2nd gear. AC off, but no heat on.. 105° until we got up out of the dust bowl.

--
Build Thread - Adventures of Fiona - https://wayalife.com/showthread.php?t=47407

TrailHunter · Sep 3, 2019

danford.lau said:
Bumping an old thread .. fully loaded Jeep going up long mountain roads in NorCal runs super hot . 235 to 240 going uphill . Can keep it under 235 with AC off and heat on still maintaining 60. Outside temps are 100+ . Trans temperatures seem to be okay at less than 170. Thoughts on what will help and what magnitude ...

1) PS Bruiser bumper to lower the winch
2) aftermarket radiator
Others ?

Coolant was recently flushed and coolant level is good .

Sent from my iPhone using WAYALIFE mobile app

I'm thinking the raised Winch isn't helping.

BaddestCross · Sep 3, 2019

Ahh... The 4.88s on 37s will kill you going up long grades.

--
Build Thread - Adventures of Fiona - https://wayalife.com/showthread.php?t=47407

danford.lau · Sep 3, 2019

fiend said:
In my experience overheating on the JK is most likely due to air flow blockage. Such as mud caked in the radiator fins and/or winch, lights, etc in front of the radiator. I would start there.

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Yep. Will lookup instructions on how to remove the fan and clean out the fins next weekend .

If doesn’t help may need to ditch bumper and light

BaddestCross said:
Sounds about normal to me. Did you replace your thermostat and get your radiator pressure tested though?

I just got back from another run up to the Sierras and the climb from the desert up the grade to the meadows get the temp gauge up to between the 3/4 and 1/2 marks with the Jeep loaded down running in 2nd gear. AC off, but no heat on.. 105° until we got up out of the dust bowl.

--
Build Thread - Adventures of Fiona - https://wayalife.com/showthread.php?t=47407

No haven’t replaced thermostat . Assuming it would throw a code if it was bad ?

Yah it isn’t too bad . Can make it up all the grades we have in Cali with AC off .. but not optimal . Would rather be able to do both

TrailHunter said:
I'm thinking the raised Winch isn't helping.

Yep . What do folks like for bumpers that recess winch ? I’m looking at evo quarter pounder and the PS Bruiser . Partial to a bar or some sort tho and I like the bruiser low bar better than the stinger on the evo

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fiend · Sep 3, 2019

danford.lau said:
Yep. Will lookup instructions on how to remove the fan and clean out the fins next weekend .

If doesn’t help may need to ditch bumper and light

No haven’t replaced thermostat . Assuming it would throw a code if it was bad ?

Yah it isn’t too bad . Can make it up all the grades we have in Cali with AC off .. but not optimal . Would rather be able to do both

Yep . What do folks like for bumpers that recess winch ? I’m looking at evo quarter pounder and the PS Bruiser . Partial to a bar or some sort tho and I like the bruiser low bar better than the stinger on the evo

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I recent switched to a genright bumper with the winch recessed between the frame rails. It has a small bar hoop, not a big “stinger” thing.

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danford.lau · Sep 3, 2019

fiend said:
I recent switched to a genright bumper with the winch recessed between the frame rails. It has a small bar hoop, not a big “stinger” thing. View attachment 333971

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Ya I like that one too . Will add to the list .

Did you notice temps drop after winch moved down?

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fiend · Sep 3, 2019

danford.lau said:
Ya I like that one too . Will add to the list .

Did you notice temps drop after winch moved down?

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Hosing the mud out of the radiator made the biggest difference. I feel like lowering the winch helped too, but I haven’t done any scientific comparison.

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rubiDave · Sep 3, 2019

No hard data, but I feel like mine ran cooler before I put on the winch cover.

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danford.lau · Sep 3, 2019

rubiDave said:
No hard data, but I feel like mine ran cooler before I put on the winch cover.

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That’s an easy AB test . Winch cover coming off next time I hit the grapevine .

Have new radiator hoses anyway so will pull replace and flush fins at some point .

Other than the light frame rubbing and this over heating .. rig seems to be running awesome

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HighwayTrout · Sep 3, 2019

I just looked at your build thread. The winch is probably your main concern.

Ruvicon · Sep 3, 2019

Change your heater hoses at the same time as radiator hoses and replace your thermostat too while system is open. Use only Mopar parts. Ask me why I know...

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Ddays · Sep 3, 2019

fiend said:
I recent switched to a genright bumper with the winch recessed between the frame rails. It has a small bar hoop, not a big “stinger” thing. View attachment 333971

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Wow, can't get more recessed than that. Good looking bumper and looks like it would solve the airflow problem. Genright makes some nice stuff.

Highway Overheating

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