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One of the accessory bearings could be going out (I.E.-alternator,water pump,etc)If the noise is near an idler or tensioner pulley,it could also have a bad bearing.The best thing to do is remove the serpentine belt or release the tensioner pulley so the belt is loose,then you can spin each accessory pulley by hand and listen for the noise.You'll also feel the pulley dragging while you spin it and it might have a ratchety feel to it(in other words,as you're rotating the pulley you'll feel it spin somewhat freely and then it will feel as if its catching on something) If the belt itself is bad,it usually makes a squealing or chirping sound.If your vehicle has a vbelt drive with multiple belts,check the pullies the same way as described above and make sure the belts are all tight.A loose belt normally causes a squealing noise rather than a whining noise.Check your power steering fluid level too because the pump will whine if it gets low on fluid.
Get an inexpensive mechanics stethoscope and put the end on the shaft part of idler pulleys, housing near bearings of alternator and water pump etc.
If that doesn't give clear results, try squirting a little water on the serpentine belt as if runs [a length of small drip irrigation hose works really well to get a little water on the belt]. The water will provide harmless temporary lubrication to the belt and change the sound if it is caused by the belt slipping.
The bearing in the pulley is a single row ball bearing so you can expect a slight side movement in the pulley. Check the drive belt for cracks. Ensure that the belt is running at the top of the pulley and not down in the groove. Lastly if there is no other obvious problems then change the drive belt
Most chirping noises are due to bad pulleys on the motor. It's usuually an idler pulley or belt tensioner pulley. May also be the bearing in the alternator. Use a stethescope to check otherwise you can use a rubber hose. Put hose up to one ear and put other end by each pulley. Should hear high pitch chirping.
check all of your pulleys (a/c, idler pulley, water pump, etc...), make sure they all turn by hand and don't seem loose. sounds like you might have one locked up or sticking really badly.
Might be your water pump. Check for drips of antifreeze
Usually the bottom of the pump has a weep hole and the 1st sign besides the noise is antifreeze dripping from the weep hole
There's a spring loaded Idler pulley that keeps tension on the belt. If the arm that puts the tension on the belt seizes it may not be putting enough tension on the belt. It will need to be replaced.
check your pulleys. but if you have a Dayco belt on your truck, sometimes they're noisy. Its just the design. But they're good belts. But I would check the pulley on your water pump first, just in case of bearing wear. That's the best way to start.
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