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Whats usually the common reason for belts wheening on our cars?

I was told to try to tighten them, but when i checked today-they seemed for me to be tensioned enough.

Allignment looks good - but who knows........

And this is normally at low speed and low rph
 

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If it's the alternator belt, what happens is that the rubber bushings at the alternator pivot bolt wear out, and the alternator rotates slightly, so that the pulley is out of line with the crank pulley. So you need to replace the bushings (available in the US for about $4 each at the dealer), and slide the alternator sideways ever so slightly to line up the pulleys.

To test this, you can carefully pry the alternator sideways with a tire iron with the engine running - but be careful not to get caught in moving parts! If the noise stops or decreases, that's the issue.
 

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i think your on to something here. if they are not worn out, something could be stuck and hinders the flexibility-

I will check this tommorrow-night here now :yawn:
 

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My a/c belt will whine when I first turn it on. The a/c unit was replaced in 2012 due to the old one was shot. So I am guessing that they don't have something adjusted correctly.
 

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