2002 Ford Escort squealing sound

Tiny
KEVINNN
  • MEMBER
  • 2002 FORD ESCORT
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 118,000 MILES
I have a small squealing sound that starts about a minute or so after I start the engine that started about six months ago which sounds like it comes from the serpentine belt but it has been replaced two times and the tensioner once within two months but has not helped at all. It is not too loud. But then a couple of days ago I turned on the air conditioner for the first time of the season and the sound got about 20 times louder. If anyone can help I would be very grateful.
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Sunday, April 11th, 2010 AT 10:37 AM

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Tiny
CARADIODOC
  • EXPERT
Hi kevinnn. Welcome to the forum. Two possible approaches. Remove the serpentine belt, then run the engine just long enough to verify the noise is gone. If it is not, that proves the pullies are not the source of the noise.

Use a stethoscope to pinpoint the noise source. Listen next to each pulley while spinning them by hand or when the belt is running them. Since the noise is worse with the air conditioning running, the extra load of the compressor does point to a belt squeal, but it could be a bearing in an idler pulley, and not necessarily the belt itself.

Look too for any belt misalignment that would be caused by a sloppy bearing in a pulley or a mispositioned arm for the tensioner pulley.

Caradiodoc
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Sunday, April 11th, 2010 AT 2:25 PM
Tiny
KEVINNN
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Caradiodoc, It turned out not to be either one of your guesses. After doing a lot more internet research, I went into the direction of maybe the PCV valve or the crankcase breather element. So last weekend I took it to a large chain fast-lube place and they said my car didn't have either one but did pull off and looked at and put back a cylindrical part off an air intake hose which nobody I checked with still knows what it is called but is about 2.5" diam. x 1 inch high (just estimate but I am attaching a pic) To my surprise, for the VERY first time in over six months it stopped making the noise. And it stayed that way almost the whole day even though I made a lot of trips that day!! But then it went back to the usual squealing that evening. So today I went to a large auto repair chain and told them what happened so they pulled it off again and it helped for about two minutes so I knew we were on to something. So they took it off again and blew it out this time. They also said that they heard pressure being released when they started unscrewing the oil filter. And the problem disappeared again and is still working great after multiple trips throughout the day! I am so happy to be making progress. I am anxious to see if the sound is still gone tomorrow. Again, the sound has been constant for over six months. The only time it has disappeared is the two times that thing has been taken off and put back. Also I neglected to mention two things in my initial request for help that would probably have helped your diagnosis. The sound didn't start until I had driven the car about a minute. Also the sound stayed for about two seconds after the engine was shut off and sounded like pressure being released when it stopped


http://www.2carpros.com/forum/automotive_pictures/515517_whatisthis_1.jpg

. So my question is, why do neither one of those big chains know what this little device is? I also realize that the little round thing might not be the thing that is being clogged. It could be anywhere down the line. What do you think the problem is?
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Saturday, April 24th, 2010 AT 7:39 PM
Tiny
CARADIODOC
  • EXPERT
Very happy to hear you're making progress. This is a Ford-specific part so the chain guys likely won't be familiar with it. The best thing to do would be to have a conversation with the people at the dealership. Chances are they will have heard of this problem before.

Caradiodoc
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Saturday, April 24th, 2010 AT 9:30 PM

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