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If it's a toothed belt then the tensioner bearing is dry. If it's a V belt could be crud on the pulleys or the idler (if fitted) bearing. Or it might just be too slack or the wrong belt or iffy tolerances of a pattern or cheaper substitute part. Assuming its a tension problem, between 13 and 25 mm (half to one inch) of slack in the centre of the longest free length is good tension. To check the tension find the longest free length between pulleys, grasp the belt between thumb and forefinger and move the belt at right angles to the direction of rotation the maximum total deviation should be as above. To adjust the tension follow the instructions in the vehicle manual. If the tension is good and it still squeals, stop the engine, smear some washing up liquid on the belt then start the engine and run for a few seconds until the belt quietens. It will self clean the pulleys. Stop the engine and check the tension. If all else fails, there is a proprietory anti-slip spray available at most motor parts stores, just follow the instructions on the can.

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