Insane fan noise

[krakaman24]

Hey all! I've got a problem with some ridiculous noise coming from what I think is my fan. My truck has been doing this forever and I can't seem to figure out what it is. When around other Cummins none make this amount of noise. Mine is definitely abnormal.

My truck sounds literally like a jet engine that gets more intense with my RPMs. It seems like it is fan noise. It's so bad that when driving into my neighborhood I get funny looks from people thinking I'm doing mach 3 down the street. I can't even hear the low rumble of my EPA governed diesel engine.

Nothing effects it. Hot/cold engine, hot/cold outside temps, or speed. It's always consistent with RPMs which leads me to link it to the fan. I can't hear myself think inside my truck due to the noise. It's been driving me nuts.

Anyone have any ideas? What should I be looking for? I have a video recording the noise I'll try to post.

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[krakaman24]

Looks like Youtube is the only way I can get a video up.



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[lpennock]

Sounds like your fan clutch is frozen. You could use and obd scanner that can do real time monitoring to check it. (AlfaOBD is a good one)

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[krakaman24]

Sounds like your fan clutch is frozen. You could use and obd scanner that can do real time monitoring to check it. (AlfaOBD is a good one)

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I'm all set up with Alfa. What stats/settings would I be looking at?

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[lpennock]

In the Engine module:
Engine rpm
Radiator Fan speed rpm
Desired pwm Radiator Fan PWM %

If Engine RPM == Radiator Fan rpm it is locked up. Fan speed should be 100-%PWM or % PWM (Don't remember which offhand) of engine rpm. I.e. at 1000rpm the fan should be around 60%.

Make sure hvac is turned off as ac can command increase fan lockup.

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[krakaman24]

In the Engine module:
Engine rpm
Radiator Fan speed rpm
Desired pwm Radiator Fan PWM %

If Engine RPM == Radiator Fan rpm it is locked up. Fan speed should be 100-%PWM or % PWM (Don't remember which offhand) of engine rpm. I.e. at 1000rpm the fan should be around 60%.

Make sure hvac is turned off as ac can command increase fan lockup.

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You are awesome! Thanks for that. Honestly don't know why I didn't think of the clutch. I only know enough to usually get me into trouble. I can fix anything it's the diagnosing that gets me.

Might just throw a new one in tomorrow. It's been doing this well over a year I just haven't had the time to deal with it.

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[krakaman24]

Sounds like your fan clutch is frozen. You could use and obd scanner that can do real time monitoring to check it. (AlfaOBD is a good one)

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New fan clutch first thing this morning and now......peace and quiet!! Thanks again @lpennock!

Worst part was paying for the clutch instead of waiting a month for a dealer appointment for a warranty repair. Much faster and convenient to do it myself.

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