Terrible squeal coming from engine. Help! - Mustang Evolution

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Old 03-25-2017, 09:13 PM   #1
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Terrible squeal coming from engine. Help!

I have a terrible squeal coming from my 08 V-6 Pony Premium. I have changed the serpentine belt, tensioner pulley, water pump,idler arm pulley and the altenator. Still squeals.
I am at my wits end trying to figure this out. Any help would be appreciated. Thanks.
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Old 03-25-2017, 09:35 PM   #2
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Does it squeal all of the time? Even after the car has been driven for a length of time, and everything under the hood is up to operating temperature?
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Old 03-25-2017, 10:54 PM   #3
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The squeal starts as a slow peep and then increases as the car warms up. only ran the car for a few minutes and then shut it down as the squeal increased in volume. Never even got it out of the driveway.
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Old 03-25-2017, 10:56 PM   #4
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I also am worried about the new altenator I installed. Is the pulley supposed to be hot ?
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Old 03-25-2017, 11:34 PM   #5
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It is normal for the pulley and alternator to get hot to the touch during normal operation.
If you have access to a long screwdriver, or something similar, you can touch one end to each of the accessories (alternator. A/C compressor, power steering pump, etc) and hold the other end to your ear, and use it as a mechanics stethoscope. Any unusual sounds that the accessories are making should transfer through the screwdriver, and it may help diagnose where the noise is coming from.
Be very careful to not get your hair or any loose clothing, etc. caught in the belt and pulleys!
Also, check to make sure that all of the pulleys on the accessories look like they are all aligned with each other.

I have the same problem with my truck. The belt squeaks during cool damp weather, but stops as soon as everything warms up underneath the hood. It doesn't squeak at all during the warm months. I've done everything possible to remedy the problem, but it still persists. I've decided to just live with it.
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Old 03-26-2017, 12:14 AM   #6
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Take a peak at power steering fluid?

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Old 03-26-2017, 05:11 AM   #7
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Does it squeal with the belt off? Is there any play in the pulleys? It's normal for the idle pulley to have play but the others should be pretty tight. I had a similar issue to this and it ended up being the water pump. The bearings were worn out so the pulley wiggled back and forth a little making the belt squeal at times until it got worse. It could also be a bad or contaminated belt( antifreeze or oil got on it)

A good test is the spray the pulleys will a little water. If the sound goes away on the pulley your at the issue is likely there. It could either be bad bearings or an alignment issue. If the squeal gets louder it's a tension issue.




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Old 03-26-2017, 05:13 AM   #8
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Also what brand of belt do you have?


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Old 03-26-2017, 05:28 AM   #9
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A length of hose will also work as a stethoscope (I'll repeat be careful!!) the ? by Henry is good. Some cars want a Gates (or OEM) belt. They can be fussy
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Old 03-27-2017, 09:23 AM   #10
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MAke shure you have the wright belt and check the ajustment on the Tensioner pulley.
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Old 03-29-2017, 07:04 AM   #11
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It could be the clutch on the A/C compressor.
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Old 03-29-2017, 07:25 AM   #12
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when trouble shooting remember the compressor will run in defrost mode
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Old 06-04-2017, 11:57 AM   #13
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I have the same problem i am hopefully going to fix that tomorrow i just bought a new serpintine belt and a idler pulley. I see a crease on my Serpintine belt and i listen closely and there is a baring that went out in my idler pulley so hope all goes well tomorrow
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