Loud whining kinda sound when towing?

[cdraayer]

Sometimes when I am towing something heavy up a steep grade I hear a loud whirring or whining sound, and it goes away as soon as the load decreases. Until now I've thought it was some kind of tranmission cooler or something, but since I've been towing more and more I thought I should make sure.

Does anyone know what this is?

Thanks.

 

[Tbar]

Can you better discribe the sound ???


Tbar

 

[cdraayer]

Sorry, 2006 F250 SD PS CC FX4, 6k miles.


It's not the turbo whine, it's something else - something lower pitched, louder, and intermitant. More of a whirrr-whirrrrrrrr-whirr sound...

 

[cdraayer]

Is there a cooling fan of some kind that switches itself on in high load situations? If so, that's probably it.

 

[CHPMustang]

Sure does sound like the radiator fan and boy they roar on the 6.0's when they get hot especially when in tow on grades.

 

[draftlover]

20 bucks it's the electric cooling fans. Mine does it, too.

 

[Kleetus]

No electric fans on these... electro-hydraulic operated clutch suposedly, but I haven't got my 06 hot enough to make it engage.

 

[cdraayer]

So it could be anything from a fan to the clutch? That's a pretty wide range of possibilities.

In the event it is either, is it anything to worry about? When I hear it should I let the pedal off the floor?

 

[acjjkamp]

Mine does the same thing. I was told its a cooling fan.
Ours comes on during the summer around 100 deg when towing our trailer up steep hills. No puking so far, so it must be working

 

[powerboatr]

22 bucks its the cooling fan, mine does it towing if i am getting on it power wise, starts out kinda soft, then increases to a pretty good push and higher pitched whirr then tapers off, real smooth engagment to , it must move a chitload of air, climbing our mountain it comes on two to three times, and once while backing the rv in it came on. when i was backing up and pulling forward to many times, I really think it gets an overiding input from the tranny, because at 200-220 tranny temps, she kicks in
but of course my factory water temp gauge says "R" in the "normal" range
these fans are a superior unit to the viscous clutch ones.
very much the fan us gear sells for the 7.3