Loud Whistle

[baldyman]

04 4.6L. it has an extremely loud but intermittent whistle that happens more frequently the colder it gets. doesnt happen at all in the summer. pitch and volume vary with rpm's. dealer says its the alternator. any ideas?

[baldyman]

anybody?

[Jersey_Joe]

Hard to say luke without hearing. But that sound could b the alt. have u ever changed it before? It is possible

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Some go and some last forev. I think Alex has has had the best longevity with one lol

[RhinoZ24]

How many miles, or rather km, are on your truck Luke?

[alfie]

A sound clip
Will help


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[baldyman]

i'll see what i can do with a sound clip. i havent changed the alternator before but maybe thats what i'll do. 235,000km lol

[alfie]

If it does it all the time. When col remove the belt and see if the noise goes away. At least u can narrow it down to the drive belt system


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[baldyman]

thanks, thats an idea. i have a 45 minute drive to work every morning and its driving me mental lol

[alfie]

Also. If it does it at idle. U can pour some water on the belt and see if the noise changes or goes away. If it does them it's the belt slipping on the pullies. Simply replace the belt. If u do narrow it down to the belt system. Spin all the pullies by hand (engine off) an see if u feel a pulley that makes noise or feel something abnormal.


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[baldyman]

changed the belt this winter. whistle was before and still persists. it doesnt sound the same as a slipping belt, but i could be wrong. it sounds literally like a whistle blowing

[RhinoZ24]

Could be a really bad bearing, but if the dealer said alternator that's probably it. Although I think I've heard of the belt tensioner pulley wheel going bad and causing a whistle, but again that was bearing related.

[boze58]

My 2004 FX4 has made that whistling sound since day one,only when it's-15 Celcius or colder,and when travelling,not idling.I would rule out belts and bearings.


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[baldyman]

alrifht thanks for the input guys. hopefully i'll get to the bottom of it this week

[lee reece]

Try using a piece of ? Heater hose as a thesis-cope and try to pinpoint the sound with a little more accuracy! Just a thought ....

2007 F150 XLT FX2 SPORT - 5.4l 3V 3.73 LIMITED SLIP EDGE/EVOLUTION PROGRAMMER