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04F150SC 02-03-2007 06:08 PM

Whistling Noise When Cold Outside
Hello everyone,
I am a owner of a 2004 (new style) F150 Super Cab-4.6 (67000 miles). Today I was going to the store and I heard a pretty noisy whistling noise coming from the engine. The noise would be on and off, on and off. You could press the pedal and the noise would get louder or softer (if I put the cruise control on, there would be no whistle). The noise could only be heard when going at a faster speed (50 mph). It has never done this before. Today it was only about 5 degrees here-the coldest it has been all year. Does this noise have to do with the coldness, or something else? Any help would be great. Thanks!

great white 02-04-2007 03:38 PM

Same here, current temp 2F. I get the same "whistle" nosie at speeds between 40mph and 50mph and a tach reading of 1900 to 2000rpm. I had read on previous post that it could be the intake were it connects up to the fender well. Tried to reseat mine problem still exists. I had read on previous posts that alernator is suspect. Other posts say tensioner. I have had experience with tensioner going out (98 Expedition) and the nosie is not the same. My only other thought is power steering pump.

The weird thing is I cannot duplicate when vehicle is stationary and I bring the idle up to 1900 - 2000 rpm.

This does seem to be a common problem. I want to fix mine but its just to darn cold to get under the hood.

Big-Red-Lariat 02-04-2007 08:46 PM

just took mine to the dealer for this, and they told me there is a TSB calling for a belt upgrade...they ordered a belt.
I dont see the TSB online...does anyone know the number?

kevincw 02-04-2007 08:52 PM

The cold weather whistle is the coolant overflow tank TSB. The fix is that the dealer puts two stop leak / lube pellets in the radiator. All fixed.

BOSSMAN302 02-04-2007 08:52 PM

I work at a dealership and just started having this problem when the cold weather came. we have 4 f150s and 1 explorer doing this. have tried belt and tensioner, disconnecting the alt and driving still there, we even called ford and there suggestion was to seal off the air cleaner, we did this but the noise was still there. Also changed the throttle body but that didn't fix it. I personally think it is in the intake but have not proven this yet. If anyone has truly fixed this problem we would love an answer to this problem. thanks in advance.

WVF150VIANC 02-05-2007 11:09 AM

Yep, mine's doing it as well. Mine also does it first start of the day. It's really starting to get aggravating.

04F150SC 02-05-2007 01:48 PM

Well, if anyone finds a solution to the problem, please post it. Thanks for the advice so far.

Doogie S 02-05-2007 02:20 PM

From what I have read in other forums, it is the alternator that is causing the whistle.

However, if the belt is removed and the truck is driven and the noise still exists, then that kind of kills that idea.

Mine whistles at 1800 to 2000 RPM range only at -12 Degrees C or colder and only when driving down the highway or around town. It cannot be duplicated in park or neutral.

It would be interesting to see how others have fixed the problem. The ones that I have heard being repaired have all been alternators...


04F150SC 02-05-2007 04:48 PM

Did the whistle go away when the weather warmed up? The reason I ask is because this is the first time I have had the truck in this cold of weather..

great white 02-05-2007 05:32 PM

Here is what I tried today. Temp's today hovered around 5 degrees. Anytime I reached that magical 1800rpm to 2000rmp range the whistle was there. As the engined warmed to normal operating temps (mid range on gauge) whistle was still there. As I was on the highway I could set my cruise control around 68 mph (1900 rpm est) and the whislte was constant. While in cruise mode I tried the following:

Heat off = no change
Lights on = no change
Radio off/on = no change
AC on = no change
Wipers on = no change

This symptom is range specific. Today I noticed for the first time when the vehicle hit that 1800rpm to 2000 rpm range, in any gear the whislte would return.

So before the end of my trip on the highway today I thought I would try something different. I brought the vehicle up to 80 mph and let the vehicle coast thru the 1800rpm -2000rpm range (in neutral) and there was no whislte.

I am leaning towards intake, but not sure of the fix. I would think if it was an alternator when I turned on the AC while in crusie I would have noticed a drop in tone, I didnt.

As for problem going away in warmer temps, it would seem my boundry for whislte / no whislte is 25-30 degrees outside temp.

Definately one of those frustrating issues ........................

WVF150VIANC 02-05-2007 05:40 PM

Mine does it above freezing temps, but has been much worse during this cold snap. Like I mentioned in my earlier post, mine does it right after first start of the day, in PARK. I noticed if I barely touched the gas pedal while idling/warming up, it went away. It also goes away after accelerating past 70 MPH when driving.

Air intake intaking air where it shouldn't be?:-D

Ferguson65 02-05-2007 08:07 PM

Mine just started this today. My mom's 03 explorer does it, and also a coworker's 05 F150. I doubt it's intake related due to the fact that mine has an airaid MIT, and his is bone stock. It happened at about 2100 rpm every time I heard it, went away when it warmed up. I drove it today because I was dropping it off for service tomorrow, so I just added that to my list. Also noticed that it will only happen with a load on engine, very noticable on hills.

kevlm 02-05-2007 09:26 PM

my '04 f150 does it also when it's cold. Usually it only does it when the vehicle is moving and RPMs are at the 1750 to 2000 rqange. Tonight, after work, I was sitting in the parking lot waiting for it to warm up. The dreaded whistling began so I opened the hood to try to locate where it was coming from. Air intake, belt or whatever. It was definately coming from the front of the engine. It was hard to pinpoint with the moving belt and the different pulleys, but I'm pretty sure it was the altenator. Bringing it in for the 30000 service on the 19th and will tell them my findings. If it is that and they fix/replace the altenator, and that ends the noise, I'll post back then.

Red Star 02-05-2007 09:51 PM

I noticed same thing tonight.

-6 F here in Milwaukee. I got out of college, started it up and I head whistling noise for few seconds. I left truck running for few minutes until it warmed up. Then started driving, heard whistling noise again (low speeds, maybe 15-20 mph) for few seconds, and that was it, I didn't heard whistling noise again. I drove as fast as 60 mph tonight, but didn't heard whistling noise again.

2005 SuperCab 4x4 4.6L, 4,100 miles.

kfx400_1124 02-05-2007 10:29 PM

I've had the whistling going on for about a year, only when it is cold, like 30 or below, noticing it more now that it is well below zero, mine when went away with warmer weather. Also went I let off the gas the noise went away. So thats my story.

'04 fx4 Scab 5.4L w/ roushcharger

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