I have a 2004 Kia Rio, it has been squealing since I changed the alt. Since then I have replaced the alt, water pump and water pump and it started squealing agin.
I have a Kia Rio 2004. I had to change the alt about a year ago and since then I had to replace about 5 alt belts. I have also replaced the alt, water pump and timing belt and it still squeals
So either you have a bad Belt Tensioner Assembly or some of the pulleys are out of line.
Like tennisshoes says, it is a miss alignment of the serpentine belt and the most common causes are the belt tensioner, and or idler pulleys, or both.
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