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Adjust the tensioner. I did the same thing thinkin it could be this that or the pulley. Adjusted that tensioner tight as can be and it went away. Another cause would be the air compressor pump itself. Sometimes it ties up and doesn't move freely and the serptine belt will squeel around it. A tell tail sign of this is a bad smell after/during running. Another way to know if this is starting is if it only squeels for a little bit and then stops. This is about a $500 job. You either have a worn belt that needs replacing or your belt tension is insufficient and needs to be tightened.

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โˆ™ 2009-07-02 15:45:48
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Q: What causes the AC belt to squeel badly when the AC is turned on in a Jeep Cherokee Sport?
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