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Alternator belt has a constant squeel for about 2 mins then stops, then when you start , so does the squeel. if you run the air and headlight the same thing happens. the belt seems and appears to be tight. Now what?

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Thanks for choosing FixYa and welcome to the site. There is a chance that the alternator pulley is bad or the alternator is not working properly. This may lead back to a weak battery. You need to check to make sure the battery is holding the proper charge. Check all your terminals and make sure they are clean. There could be a chance that the belt is to tight. There are some belts that can be tightened to much. Some vehicles are equipped with this. This is usually the bottom bolt of the alternator. Try to loosen it a little, not to much and see if that helps. If you have any questions, feel free to ask and thanks for using FixYa.

Posted on Apr 07, 2011

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At start up I have a loud squeal on my 99 Mazda 626. Both belts are new and so is the alternator. The squeal only last for about 10 secs or so and goes away. I have started it in neutral and the squeal is...


Does your car have air conditioning.? Most cars use the A/C compressor to dry the air for the defrost. It will also come on for a short time when you first start the car. With the engine running after the squeel has stopped , try turning the A/C on , If the squeel starts again , then I would think your A/C compressor is seized. Also . are you sure the 2 new belts are tight enough?

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1 Answer

I have a 2001 Sonata. I have a squeeling pulley.


It sounds like you have a worn or streched belt making the sqeeling noise. Whenever you turn on a
device in the car that draws a fair amount of voltage
ie. a/c or headlights it will cause increased drag on
the alternator and if you have a loose/worn or glazed
belt, it can slip around the pully making the squeel.
To adjust the alt-a/c belt loosen the mounting bolts
on the tensioner, then use the adjuster bolt behind
the tensioner pully to loosen and tighten the belt.
Be sure to check the belt for cracks bald spots etc.
While the belt is loose spin the pullys to make sure
they all spin freely. Also I would replace the belt just
to be sure. Hope this helps

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1 Answer

My jeep liberty 2005 has a high pitch squeel when I first start it in the am. The squeel later returns when in idle but only periodically.


we call it the fan belt,it is loose enough to cause it to slip(squeel)whenn cold it just needs adjusting.(the 1/2 inch wide belt that drives the alternator).

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There should only be about 1/2" deflection on the belts if you push down with your fingers. If they are ok i would suggest you investigate your alternator first , then last resort water pump bearing.(new water pump)

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1 Answer

Headlights randomly turning on and off,


with lots of the early 90's vehicles headlight malfunction can be caused by a disfunctional alternator either you may need to replace the alternator or sometime what can happen is the belt may be to loose if its not either of these you may just need a new battery

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Tightening fan belt


hi, there are 3 bolts on the alternator if you losen the lower 2 first then the top 1, using a large screw driver as a lever between the engine and alternator pushing untill the belt is tight but not over tight or it will burn out, then tighten upper bolt then lower 2

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Squeeking noise


Hi ncharron,

The first thing I'd check would be the belt(s) (tension, fraying, damage).
Second and most likely source of the problem is the alternator.

If you have someone to recruit as a helper, have them start the engine while you listen for the source of the squeel.
If you have a meter available, check the output voltage. From the Alternator.

The dropping voltage on the gauge is the key pointer here. It should maintain above +13.5VDC with the engine running.

The Squeeling is not a happy noise. Luckily an Alternator is easily checked and if necessary, replaced.

Let me know what you find out. That will tell us how to proceed.
Mike

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