Having some things happening...

The first one is when the temp is below 30, the truck whistles. It doesn’t do it all of the time - just mid-speed.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
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The second is that the truck is starting to have a knock noise in the engine. Is this something ford is fixing? The truck is still under warranty so I would like to get it fixed before it runs out.

Thank for your input.<o></o>
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thats weird i just noticed my 08 doing the same thing.....are you hearing the whistle in the cab while driving?

 

yes you can hear it in the cab.

 

For the whistling...
Check your alternator or tensioner pulley...
There has been "issues" on that in the past...

 

My bet would be the whine is from the alternator. I had the same problem with my 2002. I checked the amperage output myself, and also had a shop check it and the alt was working really well, it just had a whine. Moral of the story: your alternator is probably working fine, its just making an annoying noise. My whine went away in warmer weather so I just left it.

 

in cold weather I had the same whistle only while driving. turned out to be a leak in the third brake light. the gasket had a problem with it and would shrink in the cold weather. the gap would whistle while moving. easy fix , if that is the problem

 

Is your knocking loud enough to here in the cab. I have a 05' 5.4 and when it gets warmed up it sounds like a Diesel F250/350. I went to the dealer to have them look at it and they said it was normal for f-150's 04-09. What a crock.