Engine fan noise - Dodge Cummins Diesel Forum
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post #1 of 28 (permalink) Old 09-28-2019, 07:03 AM Thread Starter
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Engine fan noise

Find this very annoying, everytime I start up my truck and leave without waiting too long idling it, for the first few block and engine fan is full bore and is very noisy. Love that the new engine is a lot quieter now, but find this very annoying that the first couple blocks is only the fan you hear from the truck. That's with a/c on or off. Is this normal?


2007 s400/s500 with some fuel play truck
2010 Black Mega (sold, cf logo truck^)
2019 Black Mega HO/Aisin
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post #2 of 28 (permalink) Old 09-28-2019, 09:36 AM
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Quieter motor will make “new” noises seem more apparent.

Yes it’s normal


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post #3 of 28 (permalink) Old 09-28-2019, 10:58 AM
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So that's what that noise is?

Mine is near new and I kept thinking the rpm of the engine was way up when cold. Yet, after often looking at the tach, there is not an rpm issue and no transmission slipping. Then the thing quiets down and goes away.

Mmmmm. Now gonna look and listen to see if it is what you experience.
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post #4 of 28 (permalink) Old 09-28-2019, 11:03 AM
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mine does the same.

jason

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'19 2500
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post #5 of 28 (permalink) Old 09-28-2019, 11:15 AM
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I was so used to my Duramax doing it every morning for the last 12 years that I didn't even give it a second thought on this truck.
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post #6 of 28 (permalink) Old 09-28-2019, 11:19 AM
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Quote:
Originally Posted by elephantrider View Post
mine does the same.

+1

2019 Laramie 2500 Crew
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post #7 of 28 (permalink) Old 09-28-2019, 12:42 PM
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I pull my fan every winter come the end of October. Done it since 97.

2011,4wd LB/CC 2500 H&S Mini MCC by Tomeygun, BD protect 68rfe VB seperator plate enhanced stall triple disk TC, Super B 64.5/80/.91 3rd gen mani & inline EB, Arp 425s, Fass Titanium 95. Spare Mini in my closet.High tech old school and finally lovin it.
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post #8 of 28 (permalink) Old 09-28-2019, 12:49 PM
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Why does the fan need to be blasting when the motor is cold? I’ve never understood that.
Mine does the same as described.

2010 Ram 2500cc sb mineral gray metallic, laramie. Lovin it !!
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post #9 of 28 (permalink) Old 09-28-2019, 12:51 PM
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Viscous fluid. Needs to warm up.
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post #10 of 28 (permalink) Old 09-28-2019, 03:00 PM
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It is because the fan is engaged for the AC.

If you have a different car with an electric fan you can hear it doing the same thing when you’re sitting at a stop light.

You are noticing it on the ram because the large fan is loud and is still mechanical and as such gets louder with RPM.

Every Cummins Ram has done this for as long as I’ve owned them (12 years or so)


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Last edited by dillonjm; 09-28-2019 at 03:03 PM.
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post #11 of 28 (permalink) Old 09-28-2019, 03:54 PM
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Every Cummins I've driven has engaged the fan at startup. However, this new fan growls.

I have a truck.
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post #12 of 28 (permalink) Old 09-28-2019, 04:00 PM
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They needed to add some sound to it


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