high pitched whistle

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Apr 15, 2007 | 01:16 PM

whitecougar

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From: Nova Scotia, Canada

high pitched whistle

Today I started to get a high pitched whistle from either the power steering pump or the a/c compressor. The noise doesn't sound like when the power steering pump is low in fluid its higher pitched than that and isn't constant. My truck is a '98 f150 2wd with a 4.2 liter v6. Any advice would be greatly appreciated.

Apr 15, 2007 | 03:59 PM

LxMan1

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From: Louisville,Ky.

Could be the idler pulley or tensioner pulley. Remove the belt and see if the noise goes away. If so, turn some pulleys by hand as see if any squeak or feel rough when turning.

Apr 15, 2007 | 04:55 PM

73f350sc

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From: Murray

Could be the belt itself squeeling cause it needs replaced...check it for craks and flat spots while you have it off looking at the pulleys.
-Chris

Apr 16, 2007 | 02:37 PM

Kymber

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From: Florida

Does it make noise when you turn off the A/C or move the steering wheel? I know that on my 97 Explorer the IAC went bad and was making a loud squalling noise. $40 and good as new.

Apr 16, 2007 | 05:52 PM

whitecougar

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From: Nova Scotia, Canada

My wife was driving the truck today and said that the noise goes away when driving and comes back when idling or slowing down.

Apr 16, 2007 | 11:11 PM

liquid 1

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Belt....while you got it off check the pulleys, try and spray with belt dressing first.. if it quitens down its the belt, it want be quite for long..

Apr 17, 2007 | 12:20 AM

LxMan1

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From: Louisville,Ky.

Sounds like the IAC to me as well.

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Apr 17, 2007 | 08:57 PM

F-250LD 4x4

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One easy way to tell if its your belt is if it is squeeking at idle leave the truck running take a bar of soap and touch it to the belt for a few seconds so that the whole belt gets coated. If the squeek goes away you found your problem

Last edited by F-250LD 4x4; Apr 17, 2007 at 09:00 PM.

Apr 17, 2007 | 09:16 PM

#10

zman764

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Its not electrical is it? Have you added any new electrical toys to the cab that may have some interference in the radio system? Hey just wanted to throw somethin different out there.
Good Luck
Zach