scratching belt noise when i accelerate more and more? on 2004 Kia Optima

I have a automatic car started in it, and sometimes when i start the car, it makes a belt scratching noise. From time to time, while driving. it'll make a scratching belt noise, and its like the more I accelerate the louder it becomes. I don't know if its the tensions, the pully idle or the alternator belt. How do you know if the alternator belt is going bad. How would the threads look like. when i look at it, it seems to be look okay. it dont have much crack in it, nor shows any teeth marks on the sides. But in doing so, if i was to change the the alternator belt, is it necessary to change the tension all at once. i was just curious. && where can i find a repair book that doesn't cost an arm and leg.

by in Detroit, MI on March 31, 2011
1 answer
ANSWER by on April 29, 2011
take the belt off, spin the pulleys by hand, if they have excessive play or grinding in the bearings, replace them. If it were my vehicle based on the age, I would replace the tensioner assembly, idler, and belt.