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Answered 2014-07-09 20:32:07

Remove the serpentine belt and check the belt and pulleys for damage. While the belt is off, turn the alternator by hand listening for the noise.

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If you're describing the idler pulley or the tensioner pulley, it's probably a bad bearing. Pulley bearing failure is common and relatively easy to repair. Remove tension from the serpentine belt then turn the pulley back and forth with your fingers. It should make no noticable noise and should turn smoothly. If you can hear any grinding noise or if the pulley feels like the bearing is grinding, replace it.


It could be a loose serpentine belt. Or if the alternator is going out either way its most likely a charging problem.


To diagnose a noisy pulley, remove the serpentine belt and turn all pulley's by hand. Try to notice which of the pulleys make a grinding sound or feels loose. Even an alternator bearing can sound like just another bad pulley bearing, so don't assume that the alternator is okay. A bad bearing often feels like there are little grains of sand inside when you turn it manually, but sometimes it's difficult to detect the problem if you haven't had the experience. Note, before you remove the serpentine belt, make certain that you have some kind of drawing or a good mental image of the routing so that you can put it back.



Might be that the nut holding the wheel bearing needs tightening or that the wheel bearing needs replacing. Going to have to take it apart to get to the bottom of this one.



Your battery is not being charged because of a problem with the charging system Whether its a problem with the alternator / voltage regulator , the serpentine belt etc . you should have the charging system checked


Usually no warning signs unless a bearing is going bad, Other than that it just stops charging the battery. what about overcharging? alternator is 10 months old, as is battery, same problem


It could be that the belt and alternator are not aligned properly resulting in uneven pressure on the wheel of the alternator damaging the shaft or bearing. Also, excessive torque on the belt might cause the same problem.


I am having the same problem with a 99 Protege. I have changed the alternator and aligned/cleaned the pulleys and the problem persists.I replaced the alternator, on my 1997 Mazda Protege, seven times before someone figured out why the serpentine belt kept breaking. It was the belt tensioner! It had to be removed and rebuilt. Now it is working like a charm!! And I havn't had to replace the alternator in over 3 months!!!!


There could be so many problems. Batery, starter, alternator, serpentine belt, no spark... the list is endless. spark plugs? spark plugs?


Without seeing your car... possibly burnt off the serpentine fan belt due to a seized alternator that was not charging. See if the alternator spins over by hand; that could be the problem. I you. Mark


A 1995 Geo Prism may experience squealing if the power steering pump is failing or the serpentine belt is loose. Tightening the belt and applying a belt conditioner are the first step to addressing this problem.


Serpentine belts have an automatic tensioner, which cannot be adjusted. But your problem sounds like poor alternator performance, have it checked, at your local parts store most do it for free.



yes the alternator can generate noise or whine in the speakers.


Loose or worn fan belt would cause alternator not to spin fast enough to charge battery. Worn bearing in alternator could be causing it to seize and causing belt to slip


The simplest method to check where the problem lies, remove the negative cable. If motor still running problem lies with battery.if not running problem lies alternator .


Yes. Have had this happen to me. A serpentine belt is what brings power to both your alternator and your power steering pump. If the alternator isn't turned by the belt, it can't produce electricity, and your engine will stop. If the power steering pump isn't turned by the belt, it can't move fluid, and your power steering will quit working (note that you can still steer in an emergency, but it's VERY tough). Hope this helps. NJM



A quick way to tell if there might be a problem with an alternator is to remove the positive side battery cable from the battery while the vehicle is idling. If the engine dies, odds are there is an alternator problem.


The belt breaking would be the problem. Investigate why it broke.


If you have replaced the belt, tensioner and idler pulleys, then the problem could be the water pump bearing, alternator bearing, camshaft bearings, power steering pump or any of the items attached to the serpentine belt. You may try to isolate the sound by listening with a length of rubber hose and place it near the areas where the 'noise' you hear may be emanating from. Just be careful not to get the hose too close to the engine fan or belts as it can get caught and cause damage or injury.


Assuming this is a front wheel drive model, it could be any of the following; Rear wheel alignment off Warped rim (even slightly warped) Bad Rotor/drum Incorrect insertion of bearing race Over tightening the bearing/(rotor/drum) nut Bent spindle Bent or worn trailing arm or bushings. Bad quality Wheel Bearings.



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