Question about 2001 Nissan Altima

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RE: 2001 Nissan Altima air conditioner

I am having a problem with my car regarding the air conditioner. When I turn the air on the car begins to make a horrible screeching noise. It becomes louder as I accelerate. After I have been running the vehicle for a while it stops. It does blow very cold air so it is still operating. Its just embarrassing to turn it on. My husband replaced the belts thinking it was that problem. Is this a common problem? Thanks.

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  • ddonik83 Jul 15, 2008

    I have 2001 Altima with the same problem, noise is coming when A/C is on, and it becomes louder as I accelerate. The noise stops for a while and than appears  again. I changed a/c belt , checked everything under the hood, noise is not from under the hood The noise is coming from under  glove box, so  i checked a blower motor - it doesn't give a noise. I think its an evaporator or something in that area.


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Sounds to me like you need the alternator idler pulley. Look at it and see if it has a big washer covering portion of the pulley, or if the washer is inside the pulley. If its inside, than you have an old pulley. Replace it with the one, that has the big washer in the middle of pulley. You do have another idler for the A/C compressor. Those I have seen fail also. But 80% of the time its the alternator idler pulley.

Posted on Jul 19, 2008

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Change the pulley and noise gone!

Posted on Jun 19, 2009

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Maybe you should try to check the air conditioner compressor and see if the bearing where the pulley to the belt turn is bad, sometimes that bearing goes bad and everytime you accelerate you hear it louder because every pulley is working together with the car's engine

Posted on Jul 17, 2008

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1 Answer

2001 Nissan Altima air conditioner turns on and


It is normal for it to turn on and off to some degree. Low refrigerant will cause the A/C compressor to cycle on and off more frequently. You most likely have a slow leak. Eventually it will not work at all when the pressure gets too low. You may need a recharge, that might fix your problem temporarily. There are dyes you can put in with the refrigerant to detect where your leak is.

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