All right.. I cant figure out what it is.. when it gets about 20 degrees or less at night, and i get into my truck and drive it whistles every once in a while till my truck is warmed up... I cant figure out what it is.. its only when i am driving.. Doesnt matter the speed, or gear!.... It sounds louder in the truck.. when i roll my window down its not loud outside.. So i cant figure out what it is.. I have turned my heat off and it still does it... any anwers?

 

my truck does it too i have no idea what is making that sound it sounds like a jet engine and gets louder the higher the rpm you have it untill it warms up a little then it goes away i notice it every winter

 

Yeah i live by an airport, and when i first heard it i thought a plane was going over me... But that is exactly what i got? You have no clue what it would be.. Do you got factory exaust on your truck?

 

no my truck has aftermarket dual exhaust on it the truck has always made that sound this will be my 2nd winter i've had it. It did it all last winter and its already starting to do it this year. My friend wes has a Ford Ranger and it makes a similar sound to what mine makes. He thinks it might have something to do with the cooling fan and the clutch in it getting stuck or something like that.

 

How do you fix the clutch.. just get a new one?

 

just look up the part you need you may have to replace the entire fan you may be able to get just the clutch part of it. I'm not guaranteeing that is the problem with your truck though thats just what my friend thinks it is. or you may be able to grease the old one or something. i'm really not sure

 

anyone else have any ideas?

 

Have you heard this when your radio is completely turned off? It could be something as simple as extra resistance coming from your power antenna line being transferred through your speakers.

Just another idea.

 

yeah it does it when the radio is off, air and heat are off... And only when driving when it is cold outside......all different gears, and all diferent speeds, and rpms

 

My Dakota does this too. I checked the computer and the code I got is for my A/C Compressor Clutch....so I think that may be the problem.... is it coming from under the dash on the passenger side?