my a/c makes a really loud squeeling/chirping noise whenever its on what could be the problem?

1999 NISSAN SENTRA
142,670 MILES
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DHULSE96
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It doesn't go away until I hit high speeds or turn off the a/c but as soon as I slow down or turn the a/c back on I starts back again

I've already replaced the bearings
Feb 8, 2012 at 5:49 PM
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ASEMASTER6371
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loose belt or the compressor is locking up.

Roy
Feb 8, 2012 at 5:57 PM
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KHLOW2008
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If the belt is not loose or the compressor good, check for a bad harmonic damper on the crank pulley.
Feb 8, 2012 at 9:58 PM
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DHULSE96
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My mechanic said it might be the compresser, is tht something i need to fix right away, and can I still try to ride with the a/c?
Feb 10, 2012 at 3:47 AM
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KHLOW2008
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If it is the compressor, you can drive but avoid using the A/C to prevent any unwarranted damages if the compressor were to give way.

Feb 10, 2012 at 12:55 PM
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DHULSE96
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What if it makes a low squeeling noise even when the a/c is off and hasn't been turned on yet
Feb 16, 2012 at 3:31 PM
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KHLOW2008
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Then you would need to check the other drive belts. It could be the alternator belt or as I mentioned in previous post, a bad harmonic damper.
Feb 16, 2012 at 5:51 PM
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