Replaced the fan belts on a 96 maxima. It still screaches when started for a few minutes. It's damp today and the shriekiing appears to be toward the alternator or idler pulley. The pulley turned easily and looked in decent shape. It's also noisy for a bit when the heat is on.
If you never replaced the idler pulley, I recommend that you do so. Right now I am assuming the belts were fine before replacing them. With 145,000 miles I 'd replace the idler pulley/tensioner pulley. The reason is, with the belt off, and you spin the pulley it will seem like it is ok, however when you place the belt back on, you now placed pressure on the pulley, causing it to screech if the pulley is worn out. Another senario is the belt is not actually tight, it may look as though it is tight, but no tight enough to keep from slipping. Again, I am assuming everthing was ok before the belt replacement.
It sounds like the automatic tensioner is worn out.
It sound like a water pump barring water pump problay on its last leg they have a spray for belt in autozone or cks
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145,000 miles
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