Loud Fans????

Avar928

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Some vehicles/models don't have good sound insulation when the auxiliary fans kick on. I hear them loudly on my JLU 2.0 and my 928. Normal.
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multicam

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These threads pop up every summer. It's normal for the JL. Here in death valley my jeep's fan actually doesn't come on unless I have the A/C on.
 

DanW

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Mine runs loud like that when I've got the AC on recirc and the climate fan on high. I don't mind it because it takes the coolant and oil temp right down in a hurry. I live in a mild climate. But I also run doors off and no top most of the summer, so I rarely have the AC on in the first place.
 

sourdough

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Vent the motor compartment better.
lst let more air in by Installing the larger JT grill mesh
JL Hoodw CAI and raised hood venting.jpeg

2nd let more pass out easily by pulling the under hood sound liner, the horseshoe shaped engine cover and raise the back edge of the hood by extending the hood hinges.
JL underhood.jpeg

hood hinge extension a (1).jpeg



JL hood with hinge extensions.jpeg

These changes will not stop the fan from running loudly but it has helped mine from running as much. And in my case, were an easy, inexpensive DIY project.
 

Bob Burd

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If you run AC on auto, try turning up to 70 or 72F. My fans seem to run loud when set around 68F.
Sorry, but that hood mod makes it look like you've been in an accident.
 

Reinen

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Just to further confirm the point, I'm in the high altitude desert of Utah. When the 2.0t JL wants to cool down the fans go into "Jet Turbine Mode". That's normal. It shouldn't be happening all the time though, unless you're running the AC at max in high heat.
 

sourdough

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If you run AC on auto, try turning up to 70 or 72F. My fans seem to run loud when set around 68F.
Sorry, but that hood mod makes it look like you've been in an accident.
Forum follows function, IMHO it looks...COOL. Your factory fake simulated Rubicon hood vents look... fake. I only point this out because you called me out for functioning feature. Like a blower intake popping out of the hood, it is what it is... No worries, Cheers
 
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CptFloridaMan

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My girl knows when i’m at her house to pick her up by the fans on the jeep lol. They’re definitely loud but I’d rather have them running to keep things cool.
 

The Fixer

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I noticed the same thing, and there's a few threads on it in the 2.0L Engine section of this forum. The fans kick on in mine when the ambient temps are around 90*F; not so much when idling like in the old days of electric fans, mine run over 15 mph which I think is weird - at that speed, there should be enough regular airflow to cool things down, not sure why the fans are still running.
 

WXman

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Loud = moving a lot of air. Moving a lot of air = safe engine. I love it.

You should hear the fan on my diesel. 925 watts, exclusive to the EcoDiesel. When it kicks over to high speed it sounds like a helicopter. But I don't care because I can watch the coolant temps fall like a rock.
 

TJ_HOOKER

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My experiences in my 2021 JLUR Ecodiesel. I’ve come home twice now and the fan is in high, not crazy hot out, and the fan stayed on high after I shut the jeep off. I turned the ignition on without starting and checked the temps and all seems normal, shit the ignition off and the fan stays running. I let it sit for 5 minutes and it does not stop. I restart the jeep and then shut it off and the fan stops as if the sensor switching it is satisfied now. I feel like if I let it run it wouldn’t shut off and drain my battery, and I don’t feel like finding out the hard way lol. Not sure if this has happened to anyone else.
 

Rubycon50

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This is a known issue with the JL and there is a software update that will correct it, assuming there are no other problems. I had the same issue with mine, loud as heck. I took it to the stealership, they looked it up and confirmed there was a software update to fix it. I went ahead with the update and the issue was fixed. I have a 2018 JLU.
 

Windshieldfarmer

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Yep…the 2.0 in hot weather has a very loud fan that runs a lot. I believe it’s completely normal.
 

Ronbo Ranger

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Glad the fans work in the Jeep, if I thought it was a luxury car, I'd call all that noise a nusance. But it ain't cause it's a 70,000 dollar jeep thing.
Help me with this logic. 😆 LoL.
 

Rhinebeck01

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This is a known issue with the JL and there is a software update that will correct it, assuming there are no other problems. I had the same issue with mine, loud as heck. I took it to the stealership, they looked it up and confirmed there was a software update to fix it. I went ahead with the update and the issue was fixed. I have a 2018 JLU.
@Rubycon50

When ..... what month and year did you have that TSB applied to your JLU?

IF, you had the 2019 / 2nd revision of that TSB .... which is TSB 18-092-19 (Power Control Update) you also had the way the 2018 JL handles it's' dual batteries changed, so your JL behaves like a 2019 and newer JL which is a very very positive thing....

If you had TSB 18-041-18 Rev. B applied to your JL in 2018, then your High Rev Fan issues was addressed but not the dual battery system thing...

.
 
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