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First, check that everything is turning properly. If you have a water pump, alternator, idler pulley... whatever, that's not turning freely, it should be repaired or replaced.
Next, check the tensioner. One of the idler pulleys will be "spring loaded", meaning that it will hold tension against the belt. If the tensioner spring goes soft you'll need to replace it. Push on a tight section of the belt. It should be quite firm and difficult to deflect.
Replacing a tensioner isn't that difficult, just pay attention to the belt routing BEFORE you take it apart. It's easy to get confused later.
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How do you stop a serpentine belt from squealing in a 2004 Ford Ranger?
Change the belt
How can you stop the serpentine belt in a 2001 Yukon from squealing when wet?
Replace the tensioner. Stop it from getting wet by making some sort of shield to prevent water from getting to the belt.
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It is squealing because it is loose or worn out. Tighten it and if that does not help, replace it. If it is a serpentine belt, just replace it and check to make sure the idler tensioner is working properly.
Does belt dressing stop squealing?
Nope.
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Replace the belt.
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PUT A NEW BELT ON IT
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rub soap on the belt
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Adjust the belt or replace it with a new one.
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Just a guess, check the alt. belt.
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i
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