What's that squeal????
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Tuned
Joined: Sep 2003
Posts: 296
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From: north carolina
What's that squeal????
My son's 97 Explorer 4.0 SOHC has developed a squeal---definitely RPM related. Here's what I know it's NOT:
(1) belt tensioner (just replaced)
(2) belt slip (just replaced)
(3) water pump bearing (just replaced)
I have thought about the PS pump, but there is no indication of extra squeal when turning the wheel or any vibration. But, my next thing to try was to drain the PS pump and run a can of Lucas through it. Doing a search here, I found a reference to IACs occasionally making a howling sound. But, this noise sounds more belt related to me.
Anyone have this experience or things to try. I really don't like the component replace method of troubleshooting. Thanks in advance!
(1) belt tensioner (just replaced)
(2) belt slip (just replaced)
(3) water pump bearing (just replaced)
I have thought about the PS pump, but there is no indication of extra squeal when turning the wheel or any vibration. But, my next thing to try was to drain the PS pump and run a can of Lucas through it. Doing a search here, I found a reference to IACs occasionally making a howling sound. But, this noise sounds more belt related to me.
Anyone have this experience or things to try. I really don't like the component replace method of troubleshooting. Thanks in advance!
Thread Starter
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Tuned
Joined: Sep 2003
Posts: 296
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From: north carolina
Yep, that's a thought. Not noticing any performance issues with the A/C, though. Wouldn't you think if the compressor was going, there would be some other symptoms?
I've tried stethoscoping to try and isolate it better, but can't really hear anything specific. I guess the low dollar things to try are belt dressing and changing out the PS fluid. Sure sounds like its coming from the front of the engine, so I'm shying away from the IAC howl. Someone else mentioned a strange noise related to the cam position sensor, but that's in the rear of the engine, and I can't believe its that---never heard what that sounds like to compare.
Thanks.
I've tried stethoscoping to try and isolate it better, but can't really hear anything specific. I guess the low dollar things to try are belt dressing and changing out the PS fluid. Sure sounds like its coming from the front of the engine, so I'm shying away from the IAC howl. Someone else mentioned a strange noise related to the cam position sensor, but that's in the rear of the engine, and I can't believe its that---never heard what that sounds like to compare.
Thanks.
Elder User
Joined: May 2004
Posts: 508
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From: Webster, NY
On my 97 it was the idler pulley. It got replaced after another shop replaced the belt and the tensioner and the squeal did not go away. Might want to check that as the tech at the dealer where I had it fixed (they actually have reasonable rates if you can tolerate the parts cost) told me it was a common thing. However, mine is a 5L V8.
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Tuned
Joined: Sep 2003
Posts: 296
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From: north carolina
OK, thanks. If the silly tensioner was located where you could get a shot of WD40 at it while running, and the squeal went away for a bit, then maybe you could confirm the suspicion. Anyway, guess that would be a relatively cheap attempt to fix.
Senior User
Joined: Jan 2002
Posts: 250
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When I had the AC compressor sqeal, there was no other symptoms with the AC system. Just a bearing getting dry I guess.
Also remember that the AC compressor, Power steering pump, alternator etc all have bearings in the rear of the unit, opposite the end of the belt. They usually get replaced when they are rebuilt.
The tensioner is definitely a place to look also.
Also remember that the AC compressor, Power steering pump, alternator etc all have bearings in the rear of the unit, opposite the end of the belt. They usually get replaced when they are rebuilt.
The tensioner is definitely a place to look also.
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