Question about 2001 Mitsubishi Montero Sport 4WD

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I have a squeaking sound that I think is coming from the ac compressor. I noticed it stoped when I put on belt dressing and the pulley got wet. I heard the same sound coming from other monteros as well, is this common or coincidence? I am thinking it is just a loose bearing in the ac compressor, but when I heard others have the same sound I didnt want to fix it just yet. Let me know if you have any more information.

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Once the belt become loose it slips and its friction surfaces become damaged .. even if its then tightened properly it may still slip .. an old damaged belt should be replaced and tensioned properly ... its common for older type belts to slip and make noise .. it is not as common in later cars since they often have automatic belt tension and improved belts .. any slipping is a sign of some other problem ... one frequently seen problem on some cars is a pulley that is spring loaded to keep the belt properly tightened .. the pivot on the pulley freezes up and no longer maintains proper tension .. those pulleys can sometimes be re lubed but often are hopelessly frozen and need replaced ... also other pulleys and the alternator bearings can start to make a squeaking noise when the sealed bearings lose there lube .. you can put a drop of oil on each bearing to see if one quiets the sound ..

Posted on Sep 17, 2010

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Check for tightness and you can spray with belt dressing and try some WD40 on the compressor pulley.

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