Possible 2023 fan issue
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Trailering
Joined: Jun 2023
Posts: 24
Likes: 6
Possible 2023 fan issue
I have about 800 miles in my ‘23 Lariat Ult 6.7. I really like the truck a lot so far. I started my commute home a couple of days ago in the 105 degree San Antonio heat (stop and go traffic for most of it) and I noticed that the truck was really loud. I turned down everything else that was making sound to listen. It sounded like a fan was going as fast as it could go-very, very loud. Up until now, this truck has been one of the most quiet vehicles I’ve owned. Anyway, it seemed to me that the RPM’s were higher than normal, especially when coming to a stop. It lasted the entire 30 minute drive home. It has not done it since (2 days). I went ahead and made an appointment at the dealer for next Friday. This is my first diesel and I am NOT a mechanic, but I have to tow a trailer to move my daughter to Houston in 2 weeks so I’d like to make sure it’s ok. Any ideas? Thanks for any input.
BTW, there were not unusually high temps when this was happening.
BTW, there were not unusually high temps when this was happening.
Cargo Master
Joined: Apr 2018
Posts: 2,406
Likes: 1,123
The fan engagement is PCM commanded.
There are various things that the computer looks at besides the actual temperature of the radiator. Things like transmission, temperature, fuel temperature, intercooler, temperature, etc.
There are various things that the computer looks at besides the actual temperature of the radiator. Things like transmission, temperature, fuel temperature, intercooler, temperature, etc.
Lead Driver
Joined: Nov 2005
Posts: 8,472
Likes: 4,965
A/C makes the pcm engage the fan at a higher percentage, that is mostly what is making it pull so hard in this heat.
Mine does exactly the same thing, totally normal.
Get out on the highway for a high speed stretch and it will back off.
Mine does exactly the same thing, totally normal.
Get out on the highway for a high speed stretch and it will back off.
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Trailering
Joined: Jun 2023
Posts: 24
Likes: 6
Ltngdrvr, thanks for the insight/information. My (black) truck was sitting in the sun for several hours, so I had the A/C on max, which I haven’t needed to do until that day.
Lead Driver
Joined: Nov 2005
Posts: 8,472
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Waste of time taking it to the dealer, I'd cancel the appointment.
More Turbo
Joined: Sep 2019
Posts: 571
Likes: 56
My new 23 does exact same thing. Normal. Did it today on cold start but it was 95 out and I had turned on the AC before I put it in drive. And yep towing you will hear the jet engine!!! But it cools everything off nicely
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Super Moderator
Joined: Aug 2008
Posts: 37,383
Likes: 1,867
From: Frederick, MD
normal, mine is black and you should here it 90 plus temps. As you get going up to speed then it will back off some but you can here it cycle.
Understand that when towing and if you have a heavy load it will come on regardless of outside temps if you are working the motor.
Mine will come on at 225F oil temps even though the coolant temps is only around 210F.
Very agressive strategy to keep it cool with the heavy loads.
Understand that when towing and if you have a heavy load it will come on regardless of outside temps if you are working the motor.
Mine will come on at 225F oil temps even though the coolant temps is only around 210F.
Very agressive strategy to keep it cool with the heavy loads.
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Trailering
Joined: Jun 2023
Posts: 24
Likes: 6
normal, mine is black and you should here it 90 plus temps. As you get going up to speed then it will back off some but you can here it cycle.
Understand that when towing and if you have a heavy load it will come on regardless of outside temps if you are working the motor.
Mine will come on at 225F oil temps even though the coolant temps is only around 210F.
Very agressive strategy to keep it cool with the heavy loads.
Understand that when towing and if you have a heavy load it will come on regardless of outside temps if you are working the motor.
Mine will come on at 225F oil temps even though the coolant temps is only around 210F.
Very agressive strategy to keep it cool with the heavy loads.
I appreciate everyone’s quick responses and I’ll be canceling my appointment at the dealer.
Great forum.
Super Moderator
Joined: Aug 2008
Posts: 37,383
Likes: 1,867
From: Frederick, MD
just wait until you are pulling a long grade with a heavy load and that kicks on at 2K rpms.
ready for take off then.
but it cools it down really quick and then goes back to a lower un-noticeable speed.
ready for take off then.
but it cools it down really quick and then goes back to a lower un-noticeable speed.
Tuned
Joined: Oct 2009
Posts: 418
Likes: 135
From: South Texas
I don't have a 2023, but a 2022. Last summer I had the same thing happen. Same temp same town. Seems like a little quieter this year (after 10K miles) but still loud. Another reason I will be glad to see fall.
Fleet Mechanic
Joined: Nov 2019
Posts: 1,429
Likes: 487
From: North Carolina
When i have 32k behind the f450 moving theough town, it sounds like a jet engine taking off for flight! People walking around actually turn around and look. If you didnt know any better youd think it would blow up. Especially when it downshifts and hot the fan makes it sound like it's severely Over revving.
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