Loud Fan Noise/Whine

[RoadDog66]

So it's been ridiculously hot and humid around here for last several days (high 90's to low 100's). We went on a camping trip with the trailer and because of the heat we had to have the A/C on the whole time.

The truck did fine, the gauges all stayed normal and no overheating or signs of any issues. When we got home and were unloading I heard a very loud and unsual fan noise (more of a whine) over top of the normal A/C compressor fan noise. It was a sound I've never heard from my truck before so it concerned me.

Any ideas?

[bob-w]

my guess - the electric aux fan - it has two speeds Hi sounds loud!

[RoadDog66]

So you think it was the auxilliary oil cooler fan?

[bob-w]

my 2008 has a aux electric fan in the upper passenger side of the radiator it is controled by air cond settings and engine temperature thru IPDM and ECU. Mine only blows in Hi mode with air on and stopped on very warm days.

[RoadDog66]

Originally Posted by bob-w

my 2008 has a aux electric fan in the upper passenger side of the radiator it is controled by air cond settings and engine temperature thru IPDM and ECU. Mine only blows in Hi mode with air on and stopped on very warm days.

Is it noticably louder than when just the engine cooling fan runs?

[bob-w]

yes it much louder when aux fan is on in hi mode and just a little noisier when it is running in its lo mode.

[RoadDog66]

Thanks Bob. I'm gonna hope that was all it was

[BriDroid]

+1, most likely that was it. It's quite loud, even inside the truck, when it comes on. Outside it's just crazy loud. That little fan pulls a lot of air!

[Clint]

+2, it sure grabs your attention every time it kicks on.

Clint

[BurninChrome]

I can hear and feel it when mine kicks on...Titans have the same problem or at least mine did.


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