High pitched squeel coming from engine compartment
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Freshman User
Joined: Jan 2011
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High pitched squeel coming from engine compartment
I just bought a 2006 F150 SuperCrew with a 5.4L engine and since the weather has turned cold, I've noticed an intermittent high pitched squeel coming from the engine compartment. I've replaced the serpentine belt and the idler pulley plus another belt pulley but none of the above helped. I've also had two separete mechanics look at the problem and both are at a loss as to what could be causing the noise. The guess is maybe its an air leak coming from either the intake or vacuum lines. But nobody is really sure.
The noise seems to really become noticable when the temperature gets below 20 degrees and around 2000 rpms, but sometimes it happens at other times.
Has anyone had this same problem with this truck and/or does anyone know where this extremely annoying sound might be coming from?
Thanks in advance for any and all input.
The noise seems to really become noticable when the temperature gets below 20 degrees and around 2000 rpms, but sometimes it happens at other times.
Has anyone had this same problem with this truck and/or does anyone know where this extremely annoying sound might be coming from?
Thanks in advance for any and all input.
Junior User
Joined: Nov 2010
Posts: 71
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Haha! Mine does the same thing! I tell my friends its my Banks twin turbocharger!!!
But seriously, its the alternator. What part is doing the whistling? Is it the bearings on the pulley or the vanes that cool it just behind the pulley?
But seriously, its the alternator. What part is doing the whistling? Is it the bearings on the pulley or the vanes that cool it just behind the pulley?
Elder User
Joined: Feb 2008
Posts: 783
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From: Chicago Area, Illinois
Mine used to do it all the time in the winter when it was below 20 degrees. But only at 70 mph or higher. Sometimes it would do it under hard acceleration. Now it seems to be a lot quieter. Im in the south for most of the winter so I dont really worry about it since it dosent do it when its warmer out.
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Freshman User
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It's hard to tell where it's coming from since it only does it when it wants and I can't recreate it inside while revving the engine. I've seen 3 mechanics about it and no one has come up with a cause. But I can tell you that I'm getting extremely agitated!
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Freshman User
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Wouldn't the alternator make the noise a bit more consistently? This sound only happens periodically when it's cold. I've actually asked a couple mechanics about the alternator like you suggested and they don't seem to agree that this this the problem. However, you could very well be correct and they are just missing the problem!
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Junior User
Joined: May 2009
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From: Keller, TX
Mine had that same issue was never something I could make happen it just did it when it wanted. I changed the belt nope not it, then on a long 600 mi trip on the way home the fan clutch seized!!! Then the truck roared like an angry lion!! Just something to keep in mind!!!
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New User
Joined: May 2004
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My truck does the same exact thing. I doubt it is the alternator. I believe it is the fan clutch because of the intermittent nature of the noise. It only does it when it is really cold outside. It makes the noise at around 2000 rpm also. The noise goes away if I hit the accelerator. I'm going to replace the fan clutch and we'll see what happens. 2006 F150 XLT.
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Freshman User
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He noise mine is making is like a squeal and it doesn't matter if the truck is warmed or not. It's puzzling because the noise is not consistent. It squeals for a short time, then it's fine. What is consistent is that the colder it is outside, the longer anymore annoying the noise becomes. When the temperature gets above 30 degrees, the noise is hardly noticeable.
4wd High
Joined: Jun 2005
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squeeling noise
I've got an 06 F150 that makes the same noise. A very high pitched squeel. It only happens when it is cold and is very sporatic. 19 degrees yesterday and it squeeled on and off for a 3 hour round trip. I was thinking about the water pump?? Isn't there a bearing in there that could make that squeeling noise?? I don't know. thats why I come here!
I also remember that it happens at start up when very cold.
Anyone know of warranty issues with the alternator or the fan clutch causing this problem??
I also remember that it happens at start up when very cold.
Anyone know of warranty issues with the alternator or the fan clutch causing this problem??
Elder User
Joined: Jul 2008
Posts: 554
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From: Newport, Wa.
This wouldn't cost much and would eliminate another possability. No one else has mentioned the power steering pump. But you can buy a little bottle of power steering pump conditioner and put in. If the squeel goes away, great, but if it remaines then it's not the power steering pump and it didn't cost you much.