Whistling noise
01-20-2011, 01:40 AM
#12
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I have the same problem in my truck. Taking it in to the mechanic this week. Been told though that its probably just cold related and won't cause any damage. Just annoying - if anyone else has an idea what it could be before I go and spend the money. Would love it 
01-21-2011, 11:07 AM
#15
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Whistling noise
My truck is an automatic and I think the whistling noise comes from the transmission vent. The vent is designed to release pressure that builds in the transmission, and usually becomes coated with a little transmission fluid. The vent is covered by a cap to prevent reverse flow of air. Air pressure from inside the transmission will lift the cap to vent the air. During cold weather the oil-coated cap won't always move freely and may only partially lift or get cocked, causing the escaping air to whistle.
The noise stops or changes pitch when you let off the throttle because the pressure inside the transmission is reduced, and unless the vent is badly oil-soaked and dirty, the whistling only occurs during cold weather when the oil is coagulated from the low temperatures. In my truck, the whistling noise is worse when the truck is cold and will usually lessen as the transmission warms, but not always. I'm at 95K miles and my vent probably needs to be cleaned, because on some days it won't whistle at all and I think it's due to the cap being stuck at full open. Remove the vent/cap assembly and either clean or replace it...you may also want to change your transmission fluid. Dirty and/or well used fluid will more easily "gum-up" the vent.
The noise stops or changes pitch when you let off the throttle because the pressure inside the transmission is reduced, and unless the vent is badly oil-soaked and dirty, the whistling only occurs during cold weather when the oil is coagulated from the low temperatures. In my truck, the whistling noise is worse when the truck is cold and will usually lessen as the transmission warms, but not always. I'm at 95K miles and my vent probably needs to be cleaned, because on some days it won't whistle at all and I think it's due to the cap being stuck at full open. Remove the vent/cap assembly and either clean or replace it...you may also want to change your transmission fluid. Dirty and/or well used fluid will more easily "gum-up" the vent.
02-22-2011, 03:44 PM
#17
I have the same problem with my truck but mine is an 07 5.4L, mine is super loud and driving me nuts it only happens when I give it gas as soon as I let off the gas it stops. I've replaced the belt and it did nothing but this weekend I'm going to take my belt off and go for a quick drive to see if its the tranny and if I don't get a whistle with the belt off I know its the alternator or a pulley or something.
02-22-2011, 03:51 PM
#18
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A buddy of mine gave me his Ford Oasis login information and I remember seeing a TSB on this same subject. I can't remember what it said, and he no longer works for Ford, but if memory serves me correct it wasn't anything major. I have the same issue. 07 4.6 XLT.
I just tell everyone its my turbo kicking in.
I just tell everyone its my turbo kicking in.
02-22-2011, 06:47 PM
#20
Same problem here when it's cold out. I have a 2002 5.4 KR. From what I have read on other boards, this is a "normal" FORD thing. No one seems to know where it is coming from. My co-worker has an 2005 f150 doning the same thing. Machanic can't find anything wrong.
