Accessory drive serpentine belt tensioner is out of adjustment or your belt is old and hard. Replace serpentine belt and check tensioner for correct movement.
SOURCE: car makes a squeeling / skweaking noise
It is either your serpentine or another belt such as an alternator belt causing the squeak.
This can be resolved by either replacing the belt or making sure the tension is correct.
If it is a serpentine then replacing it will be necescary if it is alternator belt there are ways to tighten it.
Belt dressing is another temp fix for the squeal. the belts become glazed over time and will squeak and chatter spray some belt dressing on it and the squeak will go away for a while.
How loud is the squeak? 1-10
SOURCE: silverado 4.8 liter engine makes a whining noise.
Back pressure from a clogged catalytic converter can also cause this problem.
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