I have a 2000 F150 5.4L, within the past week, right around 1100-1600 rpm there is a really high pitched wine and I don't like the sound of it. It just started about a week ago, when it got really cold and we got snow. I'm wondering if its like the idler bearing going or what...truck only has 43,000 miles on it. Help?

 

Where is it coming from? Does it sound like the rear diff?

Our Xterra does that..but yours has no miles so it can't be that..

 

my truck does that.. after u drive it does it go away? cuz after my tranny warms up it goes away.

 

Your truck must have a supercharger.

 

NO,i have the same problem to, as soon as the weather gets cold the noise starts, i think its the clucth fan but im not sure, i havnt been abble to figur out exactly what it is though, any info would help me to.

 

it come and goes underneath the hood and like I said...just started with the cold weather could be the clutch fan...

 

mine does the same thing...just not all the time. coming from under the hood. mines def not the diff

 

Use a mechanics stethescope, they are relatively cheap at auto parts stores, with the engine running touch any area on the engine with a bearing if on is bad you will definetly hear it.

 

My truck also had a high pitched whine. Left wife at home. Problem solved.

 

^^^lmao thats funny