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2001 4Runner: Screeching sound - Need help

Discussion in '3rd Gen 4Runners (1996-2002)' started by Buoni, Feb 24, 2015.

  1. Feb 24, 2015 at 7:12 AM
    #1
    Buoni

    Buoni [OP] New Member

    Joined:
    Feb 24, 2015
    Member:
    #469
    Messages:
    1
    Gender:
    Male
    First Name:
    Bryan
    Vehicle:
    2001 Silver 4Runner Sport SR5
    Hey everyone,

    Long time visitor, and second time user. I have a 3rd generation truck that started making this noise during our first cold snap in Columbus about 1 month ago. Here is a Youtube video link to the engine and sound.... It is titled:

    3rd gen 4Runner - cold weather screech

    https://www.youtube.com/watch?v=WimarkAjvak

    Here is what I can tell you:

    1. All 3 belts are fairly new
    2. The A/C idler pulley was replaced 9 months ago.
    3. The alternator is brand new
    4. The power steering pump is not the culprit - verified by Toyota mechanic.
    5. It only does this on very cold days (we have had a lot of them), and ususally after truck has been sitting and engine is cold.
    6. The timing belt, water pump, tensioners, etc. were replaced 30K miles ago.

    I think it may be the a/c idler pulley again? (I used the Gates 38031, so it should be OEM quality)
    I am thinking it could be the fan cooling bracket?

    I have a stethoscope, but cannot totally pinpoint the noise. Any help/suggestions would be greatly appreciated!
     
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